-
Hiroo Toi, Satoru Kitamura, Yasuhiro Aoyama, Hisanobu Ogoshi
1982 Volume 11 Issue 6 Pages
773-776
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL
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Nitration of
N-methyloctaethylporphyrin (
1) takes place at the meso positions adjacent to the N-alkylated pyrrole ring (so-called α- or δ-position). Deuteration with CF
3COOD-D
2SO
4 suggests preferential electrophilic substitution at α- or δ-position on the basis of
1H-nmr investigation.
View full abstract
-
Minoru Hirota, Kazuhisa Abe, Hiroshi Tashiro, Motohiro Nishio
1982 Volume 11 Issue 6 Pages
777-780
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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The stereoisomeric(threo/erythro) ratios of the reaction products were estimated from the conformational ratios of the reactant calculated by molecular force field approach. Examples of the oxidation to sulfoxides of alkyl 1-phenylethyl sulfides and the hydride reduction of alkyl 1-phenylethyl ketones were given.
View full abstract
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Yoshihisa Inoue, Mikio Ouchi, Toshiyo Nakazato, Takashi Matsuda, Tadao ...
1982 Volume 11 Issue 6 Pages
781-784
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Stilbenocrown ethers
3a,
c and
4a,
b were synthesized in a cyclization reaction of benzoin with oligoethylene glycol ditosylates(
2a-
c) under a phase-transfer condition. Extractions of aqueous alkali picrates(Na
+–Cs
+) were examined with the distilbenocrown ethers
4a,
b, the partially-hydrogenated tetraphenylcrown ethers
6a,
b and the fully-hydrogenated tetracyclohexylcrown ethers
7a,
b.
View full abstract
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Junko Akashi, Motomi Katada, Hirotoshi Sano
1982 Volume 11 Issue 6 Pages
785-788
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Chemical effects of the neutron irradiation of Li
3[Fe(C
2O
4)
3]·4.5H
2O and (NH
4)
3[Fe(C
2O
4)
3]·3H
2O were studied by means of Mössbauer spectroscopy. No significant change was found in the neutron-irradiated (NH
4)
3[Fe(C
2O
4)
3]·3H
2O, while Fe(II) species were observed to be produced by the
6Li(n,α)T reaction in the neutron-irradiated Li
3[Fe(C
2O
4)
3]·4.5H
2O.
View full abstract
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Etsuo Niki, Jyunichi Tsuchiya, Ritsuko Tanimura, Yoshio Kamiya
1982 Volume 11 Issue 6 Pages
789-792
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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α-Chromanoxyl radical formed by the interaction of α-tocopherol (vitamin E) with alkoxyl radical or DPPH was found by electron spin resonance spectroscopy to react with glutathione and vitamin C to regenerate α-tocopherol.
View full abstract
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Shunichi Kametani, Haruo Ohmura, Hideyuki Tanaka, Shinichi Motoki
1982 Volume 11 Issue 6 Pages
793-796
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Though the reaction of chalcones
2 with 2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide
1 in refluxing benzene gave the corresponding thiochalcone dimers
3, the reaction in refluxing xylene gave new phosphorus-containing compounds, 2-(4-methoxyphenyl)-3,5-diaryl-Δ
4-1,2-thiaphospholene-2-sulfides
4.
View full abstract
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Shuki Araki, Shin-ichi Manabe, Yasuo Butsugan
1982 Volume 11 Issue 6 Pages
797-800
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Prenyl and geranyl diisopropyl phosphates readily alkenylate a variety of phenolic ethers regio- and stereospecifically without any appreciable side reactions.
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Hiroshi Sugimoto, Teruaki Higashi, Masayasu Mori
1982 Volume 11 Issue 6 Pages
801-804
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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The reaction of tris(1,3-diphenyl-1,3-propanedionato) complexes of heavier rare-earth elements, M
3+(dbm)
3 and lithium phthalocyaninato(2−), Li
2(pc) gave two types of new stable phthalocyanine complexes, [M
3+(pc) (dbm) (dbmH)] and [M
3+(pc) (dbm)] depending on the solvents used for the preparation. The structure of both types of complexes are tentatively proposed.
View full abstract
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Noritaka Abe, Tarozaemon Nishiwaki, Hideko Yamamoto
1982 Volume 11 Issue 6 Pages
805-806
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Cyclohept[
d]imidazo[1,2-
a]imidazoles (1,3
a,9-triazacyclopent[
a]azulenes), being synthesized from 2-aminocycloheptimidazole, was allowed to react with reactive acetylenes to give 2,3-diazacyclohepta[
ef]cycl[3.2.2]azines regioselectively.
View full abstract
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Kazuo Yamashita, Toshimasa Yamamoto, Hiroaki Shimidzu, Hitomi Suzuki
1982 Volume 11 Issue 6 Pages
807-808
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Replacement of two NH groups of the porphyrin in
meso-tetraphenylporphinato core by two S atoms shifts the oxidation potential to the positive direction and increases the photocurrent quantum yields of the Al/Porphyrin/Ag cells. The previously observed correlation between the ease of oxidation of porphyrins and the higher quantum yields was confirmed in a series of
para- substituted tetraphenyldithiaporphyrins.
View full abstract
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Seiji Shinkai, Yu-ichi Ishikawa, Osamu Manabe
1982 Volume 11 Issue 6 Pages
809-812
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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A new metal-coordinative flavin, 2,4-dimethylpyrido[5,6-h](10-methyl)isoalloxazine was synthesized. The complex with Zr
4+ acted as an efficient catalyst for the oxidation of alcohols and ascorbic acid under mild reaction conditions.
View full abstract
-
Katsuyuki Ogura, Michiyo Suzuki, Jun-ichi Watanabe, Mitsuo Yamashita, ...
1982 Volume 11 Issue 6 Pages
813-814
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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A ketone dimethyl dithioacetal
S,
S-dioxide was easily hydrolyzed with hydrochloric acid in refluxing methanol and this transformation was applied to a new method for making acyclic and cyclic ketones by the use of formaldehyde dimethyl dithioacetal
S,
S-dioxide.
View full abstract
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Yasuhiro Takahashi, Hiroshi Kosugi, Hisashi Uda
1982 Volume 11 Issue 6 Pages
815-816
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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The reaction of methyl (
E)-3-lithio-2-methyl-3-phenylthioprop-2-enoate (
4) with methyl (
E)-4-(
t-butyldimethylsilyloxy)but-2-enoate (
5) provides the functionalized cyclopentenone (
6) in one step, which is transformed into both Koreeda’s and Smith’s intermediates (
2) and (
3) for synthesis of (±)-desepoxy-4,5-didehydromethylenomycin A (
1).
View full abstract
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Kumiko Sato, Michiko Konno, Hirotoshi Sano
1982 Volume 11 Issue 6 Pages
817-820
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Phase transitions were found in the entitled compounds near the melting points by means of Mössbauer spectroscopic study. In order to investigate the phase transition, the crystal structure of mcnoacetylferrocene was determined by X-ray diffraction at room temperature and oscillation and Weissenberg photographs were taken at high temperatures. The phase transition was also confirmed by differential thermal analysis.
View full abstract
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Noriyuki Mizoguchi
1982 Volume 11 Issue 6 Pages
821-824
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Ring currents in individual hexagons of many catacondensed hydrocarbons were calculated systematically. It was found that the values of ring currents are distributed within the four different ranges correponding to the four classes of hexagon which are classified by the local topological structure.
View full abstract
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Wataru Kawanobe, Kazuo Yamaguchi, Seiichi Nakahama, Noboru Yamazaki
1982 Volume 11 Issue 6 Pages
825-828
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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New trivalent phosphorus compounds,
N-acetyl-
N-methylphosphoramidites were prepared readily in good yield by the reaction of phosphorous chlorides and
N-methylacetamide. By using the phosphoramidites as condensing agents, Young’s peptide and prolyl-leucyl-glycinamede(MSH-RIF) were synthesized without racemization in high yields under mild conditions.
View full abstract
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Katsuyoshi Kobayashi, Katsumi Niki
1982 Volume 11 Issue 6 Pages
829-832
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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The addition of polystyrene sulfonate (PSS) to methyl viologen (MV
2+) leads to a reversible one-electron transfer reaction of MV
2+ without the complication due to the adsorption of both MV
2+ and MV
.+. MV
2+ molecules coupled with a PSS molecule act as equivalent and weakly-interacting sites. The interaction between active sites is allosteric.
View full abstract
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Yoshio Takeda, Tetsuro Fujita, Cheng-Chang Chen
1982 Volume 11 Issue 6 Pages
833-836
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Three new diterpenoids, lasiocarpanin, rabdolasional, and carpalasionin were isolated from the stem and leaves of
Rabdosia lasiocarpa and their structures were elucidated from spectral and chemical findings.
View full abstract
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Kazumi Kishibe, Kitao Fujiwara, Kensei Kobayashi, Hiroki Haraguchi, Ke ...
1982 Volume 11 Issue 6 Pages
837-838
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Nitrate reductase activity dissolved in natural water was detected for the first time. The characteristics of this enzymatic activity were compared with the commercial nitrate reductase in terms of thermal denaturation, inhibitor spectrum, and gel permeation chromatography.
View full abstract
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Masahiro Mikuriya, Masaaki Nakamura, Hisashi Okawa, Sigeo Kida
1982 Volume 11 Issue 6 Pages
839-842
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Spectral and electrochemical properties of alkoxo-bridged binuclear copper(II) complexes of various tridentate ligands with NNO-, NSO-, SNO- and SSO-donor sets were examined. Reductions of the complexes with NNO-, NSO(and SNO)- and SSO-donor sets occurred at −0.2 – −0.5, 0– −0.2 and +0.15 V vs. SCE respectively, while the charge transfer bands characteristic of the complexes were found at 26–28×10
3, 24.5–25×10
3 and ∼23.5×10
3 cm
−1respectively. It was found that a linear correlation exists between the reduction potentials and the CT frequencies of the complexes.
View full abstract
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Hideo Tomioka, Yasuji Ozaki, Yasuji Izawa
1982 Volume 11 Issue 6 Pages
843-846
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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C–H insertion process of phenylchlorocarbene, a ground state singlet carbene, is not affected by matrix which generally exerts its effect in C–H insertion of most arylcarbenes. This reveals the origin of the matrix effects on carbene reactions.
View full abstract
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Otohiko Tsuge, Shigeru Okita, Michihiko Noguchi, Shuji Kanemasa
1982 Volume 11 Issue 6 Pages
847-850
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Several cyclic enamines with five to seven-membered rings react with 2-(1,2-diphenyl-3-cyclopropenylidene)propanedinitrile to give medium ring compounds, showing that the latter is a versatile reagent which can insert three carbon atoms between α- and β-carbons of cyclic enamines. These medium ring compounds undergo transannular reactions on treatment with hydrochloric acid to yield fulvene derivatives with the elimination of an amine component in the enamine.
View full abstract
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Tohru Kashiwagi, Koji Tanaka, Toshio Tanaka
1982 Volume 11 Issue 6 Pages
851-854
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL
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A kinetic study reveals that the reaction of MoO(S
2CNR
2)
2 with ROOCN=NCOOR (R = Me, Et) proceeds
via two successive steps which consist of the formation of a mono-capped trigonal prismatic intermediate followed by intramolecular rearrangement, affording the final product with a pentagonal bipyramidal configuration. The entropy and the volume of activation in the rearrangement (R=Et) are both positive (ΔS
\
eweq=+38.0 J mol
−1K
−1, ΔV
\
eweq=+13.6 cm
3mol
−1), which are in marked contrast to the negative values for a similar rearrangement of MoO(S
2CSPr
i)
2(MeOOCC≡CCOOMe) (ΔS
\
eweq=−83.5 J mol
−1K
−1, ΔV
\
eweq=−9.9 cm
3mol
−1). Based on these results, two different mechanisms are suggested for the intramolecular rearrangement of hepta-coordinate molybdenum complexes.
View full abstract
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Shunjiro Misumi, Hiroshi Matsushima, Haruhisa Shirahama, Takeshi Matsu ...
1982 Volume 11 Issue 6 Pages
855-858
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL
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Humulene has been transformed into 1,4,4-trimethyltricyclo [6.2.1.0
2,6]undecan-ll-one, a key intermediate for the synthesis of hirsutene, through a process which simulates the biosynthetic pathway assumed for the latter sesquiterpene.
View full abstract
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Hideo Nagashima, Kiyomi Sakai, Jiro Tsuji
1982 Volume 11 Issue 6 Pages
859-860
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL
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γ-Keto esters and 1,4-diketones were prepared by the palladium-catalyzed regioselective oxidation of β,γ-unsaturated esters and ketones. The best yields were obtained when the reaction was carried out using PdCl
2/CuCl/O
2 catalyst system in aqueous dioxane.
View full abstract
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Shin-ichiro Shoda, Teruaki Mukaiyama
1982 Volume 11 Issue 6 Pages
861-862
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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In the presence of cesium fluoride, the reaction of 2,3,4,6-tetra-
O-benzyl-
D-glucopyranose with acyl fluorides affords the corresponding glucosyl esters in good yields under essentially neutral condition. The α⁄β ratio of produced glucosyl esters is greatly affected by reaction conditions and predominant formations of each anomer is achieved by procedures described herein.
View full abstract
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Kazunori Toma, Eiji Miyazaki, Tatsushi Murae, Takeyoshi Takahashi
1982 Volume 11 Issue 6 Pages
863-864
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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(±)-Casbene was synthesized from all-
trans geranylgeraniol by a route involving intramolecular carbene-olefin cyclization.
View full abstract
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Fumiyuki Ozawa, Akio Yamamoto
1982 Volume 11 Issue 6 Pages
865-868
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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The reactions of
trans-PdR(X)(PMePh
2)
2 (R = Me, X = I and R = Ph, X = Br) with carbon monoxide in the presence of secondary amines, R’
2NH, were found to give α-keto amides, RCOCONR’
2, as double carbonylation products under mild conditions in good yields and selectivities.
View full abstract
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Kiyoshi Matsumoto, Takane Uchida, Takazumi Sugi, Yoshiko Yagi
1982 Volume 11 Issue 6 Pages
869-870
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Benzo[
a] isoindolo [1,2,3-
cd]indolizines, a novel kind of 18π heterocycles, have been prepared by one pot successive 1,3-dipolar cycloadditions of pyridinium dicyanomethylides with benzyne.
View full abstract
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Nobumasa Kitajima, Yoshiaki Hakone, Yoshio Ono
1982 Volume 11 Issue 6 Pages
871-874
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Cu(AlCl
4)
2 reacts with benzene to give poly(1,4-phenylene). When 2.5 mmol of benzene was reacted with 2.5 mmol of Cu(AlCl
4)
2 at 20°C for 2 h, poly(1,4-phenylene) was obtained in 92 % yield, which is higher than that obtained with the conventional system, AlCl
3–CuCl
2 mixture, under the same conditions.
View full abstract
-
Kazuko Takahashi, Kazumi Nishijima, Kahei Takase, Takashi Shimozawa
1982 Volume 11 Issue 6 Pages
875-878
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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The title compound and its phenyl derivatives have been prepared by the advantageous route which we have developed. These cross-conjugated compounds are suggested to have a preferable contribution of the quinonoid resonance structure at the ground state, but are slightly more polar than the iso-π-electronic 5-cycloheptatrienylidene-2(5
H)-thiophenone, revealing that the dithiolidene residue is more electron-donating than the cycloheptatrienylidene one.
View full abstract
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Vichai Reutrakul, Yupayao Srikirin, Sirichai Panichanun
1982 Volume 11 Issue 6 Pages
879-880
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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The decarboxylation of aryl sodium glycidates having substituent at the α-carbon gave the corresponding α-acetoxyketones, α-diketones and α-ketoesters in synthetically useful yields.
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Hiroyuki Ageta, Yoko Arai
1982 Volume 11 Issue 6 Pages
881-884
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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New tetracyclic triterpenoids, (24
R)-cyclolaudenyl acetate(Ia) and (24
R)-cyclomargenyl acetate(Ib), and their corresponding alcohols(IIa, IIb) and ketones(IIIa,IIIb) were isolated from the rhizomes of
Polypodium formosanum. The structure of Ia and Ib were deduced by chemical and spectroscopic methods to be (24
R)-24-methylcycloart-25-en-3β-yl acetate and (24
R)-24-ethylcycloart-25-en-3β-yl acetate, respectively.
View full abstract
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Wataru Ando, Toshiya Furuhata, Hidetoshi Tsumaki, Akira Sekiguchi
1982 Volume 11 Issue 6 Pages
885-886
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Thiosilanes such as ethylthiotrimethylsilane, hexamethyldisilthiane, and
t-butylthiotrimethylsilane, react readily with acyl chlorides at room temperature in the presence of potassium fluoride to give the corresponding thioesters in excellent yields.
View full abstract
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Yukihiro Ozaki, Aritake Mizuno, Yoshio Kamada, Koichi Itoh, Keiji Iriy ...
1982 Volume 11 Issue 6 Pages
887-890
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Raman spectrum of a diabetic cataractous lens was measured and compared with the spectrum of a normal lens. These spectra showed an appreciable difference in the relative intensity of the tyrosine doublet near 840 cm
−1, indicating that the strength of hydrogen bonding by some tyrosyl residues changed upon lens opacification.
View full abstract
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Toshio Ogino, Kazuyuki Awano
1982 Volume 11 Issue 6 Pages
891-894
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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A series of the title compounds (R=OMe, H, Me, Ph) were prepared and photochemical behaviors of these compounds were examined. Although most of the substrates underwent intramolecular [2+2] cycloaddition to give novel trishomocubanes upon irradiation, the phenyl derivative of Δ
4 isomer gave a product via competing allylic hydrogen abstraction, as well as the cyclization product.
View full abstract
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Takayuki Suga, Shinji Ohta, Toshifumi Hirata, Tadashi Aoki
1982 Volume 11 Issue 6 Pages
895-898
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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It was found that (−)-diarylheptanoid xyloside isolated from the female flowers of
Alnus serrulatoides is 1,7-bis(3,4-dihydroxyphenyl)-5-(β-
D-xylopyranosyloxy)-3-heptanone, and its spectral data and chemical behaviors coincides perfectly with those of previously reported oregonin whose absolute configuration had not been clarified yet. Then, the absolute configuration of the diarylheptanoid xyloside was investigated by a combination of the
13C NMR spectroscopy and the X-ray crystallography, and established to be
s.
View full abstract
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Keisuke Suzuki, Akihiko Ikegawa, Teruaki Mukaiyama
1982 Volume 11 Issue 6 Pages
899-902
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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(
R)-3-(
p-
t-Butylphenylthio)cyclohexan-1-one was reduced with LiAlH(OBu
t)
3 to afford (1
S,3
R)-3-(
p-
t-butylphenylthio)cyclohexan-1-o1, while the same reduction with LiBH(
s-Bu)
3 afforded the (1
R,3
R) counterpart almost exclusively. Elaboration of each product furnished both enantiomers of optically pure cyclohexenol derivatives.
View full abstract
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Yasuhiro Toyoda, Hiroaki Kumagai, Hajime Irikawa, Yasuaki Okumura
1982 Volume 11 Issue 6 Pages
903-906
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Four indolizino[8,7-b]indole-5-carboxylic acids were isolated as the methyl esters from
Clerodendron trichotomum Thunb, and the structures elucidated on the basis of their spectral and chemical evidences.
View full abstract
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Takakazu Yamamoto, Kenji Sano, Akio Yamamoto
1982 Volume 11 Issue 6 Pages
907-910
Published: June 05, 1982
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MH(succinimido) (PCy
3)
2 (M = Ni, Pd) and
trans-PtH(OCOR) (PCy
3)
2(R = –C(CH
3)=CH
2, –CH
2CH=CH
2) have been prepared by oxidative addition of succinimide or the corresponding acid to the zero-valent transition metal complexes. Treatment of the hydrido complexes with π-acids such as CO and maleic anhydride causes elimination of succinimide or RCOOH.
View full abstract
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Shoji Taen, Yasuhiko Gondo
1982 Volume 11 Issue 6 Pages
911-912
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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Under different excitation durations, the decay law has been studied on the temperature-independent delayed fluorescence in the mixed crystals of benzo[
f]quinoline in biphenyl host at 77 K. An extreme reduction of the excitation duration has been found to lead to a decay law of the form, I
DF(t) = I
DF(0)/(1 + at)
2.
View full abstract
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Noriyoshi Kakuta, Akio Kazusaka, Koshiro Miyahara
1982 Volume 11 Issue 6 Pages
913-916
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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A novel silica-supported copper catalyst, prepared from cupric acetate monohydrate having a dimeric structure of cupric ions, showed a very high activity for the CO oxidation with N
2O at 150°C as compared with a conventional silica-supported copper catalyst. It was suggested on the basis of the ESR spectroscopic characterization that such an extraordinary catalytic activity resulted from the structure of the Cu
2+ ions derived from cupric acetate monohydrate on silica.
View full abstract
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Toru Sugiyama, Kazuya Yagi, Yoko Ito, Akira Sugimori
1982 Volume 11 Issue 6 Pages
917-920
Published: June 05, 1982
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The UV-Irradiation of methyl 4-pyridinecarboxylate in methanol under oxygen in the presence of H
2SO
4 brings about methoxylation at the 3-position of the pyridine ring, while under nitrogen methoxylation and hydroxymethylation occur at the 2-position.
View full abstract
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Rei Matsueda, Susumu Higashida, Richard J. Ridge, Gary R. Matsueda
1982 Volume 11 Issue 6 Pages
921-924
Published: June 05, 1982
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All of the conventional
S-protecting groups of cysteine which were tested could be selectively converted to the 3-nitro-2-pyridinesulfenyl (Npys) group after treatment with an appropriate Npys halide. Unidirectional formation of an unsymmetrical disulfide bond is possible when Cys (Npys) is mixed with a free thiol of another Cys residue. Some of these features were exploited during the solid phase synthesis of lysine
8-vasopressin.
View full abstract
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Kiyohiko Nakajima, Masaaki Kojima, Junnosuke Fujita
1982 Volume 11 Issue 6 Pages
925-928
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
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The optically active selenide complex, trans(tertiary amine nitrogen, Se)-[Co(CH
3SeCH
2CH
2NH
2){N(CH
2CH
2NH
2)
3}]
3+, has been obtained for the first time by SP-Sephadex column chromatography. It loses ca. 50% of optical activity in 1 h at 22°C in 1 mol/dm
3 NaClO
4.
View full abstract
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Teruaki Mukaiyama, Keisuke Suzuki, Tohru Yamada
1982 Volume 11 Issue 6 Pages
929-932
Published: June 05, 1982
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4-
O-Benzyl-2,3-
O-isopropylidene-
L-threose (
1), a new building block for the synthesis of carbohydrates was prepared. The stereoselective addition of various nucleophiles to
1 afforded useful intermediates toward
L-sugar derivatives.
View full abstract
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Seiichi Takano, Nobuhiko Tamura, Kunio Ogasawara, Yoshiko Nakagawa, Ts ...
1982 Volume 11 Issue 6 Pages
933-934
Published: June 05, 1982
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Validity of the proposed structures of (−)-semburin(
1) and (−)-isosemburin(
2), isolated from
Swertia japonica Makino, has been established by the enantioselective total syntheses starting from the known chiral lactone(
3).
View full abstract
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Takashi Ando, Takehiko Kawate, Junko Yamawaki, Terukiyo Hanafusa
1982 Volume 11 Issue 6 Pages
935-938
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL
FREE ACCESS
Heterogeneous reaction between octyl bromide and alkali acetate solid in toluene is facilitated in the presence of alumina
and a trace of water. The reactivity shows a maximum for a certain amount of water, and this optimum amount varies depending on the alkali metal cation. Role of water in the interfacial reaction is discussed.
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Masanori Kosugi, Mikio Suzuki, Isao Hagiwara, Katsuhisa Goto, Kyoko Sa ...
1982 Volume 11 Issue 6 Pages
939-940
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL
FREE ACCESS
The reaction of acetonyltributyltin, prepared from tributyltin methoxide and isopropenyl acetate in situ, with aryl bromide in the presence of a catalytic amount of PdCl
2(
o-Tolyl
3P)
2 was found to give arylacetones in good yields.
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Yoshikane Kawasaki, Wataru Yokota, Norihide Enomoto
1982 Volume 11 Issue 6 Pages
941-942
Published: June 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL
FREE ACCESS
Monophenylthallium(III) complexes with a Tl–I or Tl–SR bond were prepared in the presence of dibenzo-18-crown-6. These complexes are stable in the air and to heat to their melting points. In the hydrogen sulfide complex, ν(S–H) band was found at 2570 cm
−1 and δ(Tl–SH) was observed at 1.15 ppm with
2J(Tl-SH) = 405 Hz in CH
2Cl
2 solution.
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