-
Tomokazu Matsue, Tetsuya Kato, Uichi Akiba, Tetsuo Osa
1986 Volume 15 Issue 6 Pages
843-846
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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β-Cyclodextrin (β-CD) shows an accelaration effect on the electrocatalytic oxidation of NADH by ferrocenecarboxylic acid (Fca). Quantitative analysis using digital simulation has suggested that the Fca
+–β-CD complex existing in only minute amount acts as an effective oxidant for NADH.
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Satoshi Kato, Mitsunobu Nakatani, Hatsuhiko Harashina, Kazuhiko Saigo, ...
1986 Volume 15 Issue 6 Pages
847-850
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Methyl α-cyano-4-[2-(2-pyridyl)ethenyl]cinnamate crytstal shows a high photoreactivity to form the dimer of single structure quantitatively. This result is a unique example in such point that the topochemical photoreaction of β-form diolefin crystals gives neither of the polymer nor the cyclic dimer, but the photostable diolefinic dimer.
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Tsugunori Kashimura, Kiyoshi Kudo, Sadayuki Mori, Nobuyuki Sugita
1986 Volume 15 Issue 6 Pages
851-854
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Cobalt carbonyl-catalyzed polycarbonylation of polychlorobenzenes could be easily achieved in NaOMe/MeOH under photostimulation. Moreover, under the present conditions, the carbonylation at ortho position(to another halogen atom or carboxyl group) proceeds in high selectivity(>84%).
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Akira Kase, Kiyotaka Asakura, Chikashi Egawa, Yasuhiro Iwasawa
1986 Volume 15 Issue 6 Pages
855-858
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Among new three types of “Pd / ultra-thin amorphous-oxide(La
2O
3, SiO
2, or TiO
2) layers / ZSM-5” catalysts, prepared by a two-stage attaching technique, the La
2O
3-coated ZSM-5 -supported Pd catalyst was found to be a selective catalyst for propane formation (68%) from CO and H
2 at 543 K and 1.01 MPa.
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Kiyotaka Asakura, Yasuhiro Iwasawa
1986 Volume 15 Issue 6 Pages
859-862
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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A SiO
2-attached one-atomic layer amorphous niobium-oxide catalyst was prepared by the two-stage attaching reaction between silanol groups and Nb(OC
2H
5)
5 followed by chemical treatments with H
2O and O
2. The one-atomic layer Nb oxide catalyst was found to be active and selective for ethene formation from ethanol.
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Akira Tsumura, Hiroshi Koezuka, Sei Tsunoda, Torahiko Ando
1986 Volume 15 Issue 6 Pages
863-866
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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A thin film of poly(
N-methylpyrrole) has been prepared by a chemical method. The chemical structure of the polymer resembles that of the electrochemically prepared one. A fild-effect transistor has been fabricated utilizing the polymer as a semiconducting material.
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Gorou Arai, Takashi Koike, Iwao Yasumori
1986 Volume 15 Issue 6 Pages
867-868
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Carbon fiber electrodes (CFE) were modified with either a poly(mercaptohydroquinone) film or a poly(methylmercaptohydroquinone) film by means of electrochemical oxidation. The modified CFE thus prepared showed an excellent Nernstian response to H
+ ion over the pH range from 2 to 9.
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Keigo Fugami, Shigeki Nakatsukasa, Koichiro Oshima, Kiitiro Utimoto, H ...
1986 Volume 15 Issue 6 Pages
869-870
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Treatment of 1,3-dienes with (R
3Si)
3MnMgMe provides silylated allylmanganese compounds which add to carbonyl moiety with high regioselectivity.
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Tadayo Miyasaka, Hidehiro Ishizu, Akihiro Sawada, Akiko Fujimoto, Shun ...
1986 Volume 15 Issue 6 Pages
871-874
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
JOURNAL
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(
E)-phenyl 2-pyridyl ketone
O-acyloximes (PPAO) could be highly activated by metal ions such as Fe
3+, Cu
2+, and Zn
2+, and the most effective catalyst for the synthesis of carboxylic esters was found to be Zn
2+. Furthermore, sterically hindered carboxylic esters were easily obtained utilizing PPAOs and alcoholates in high yields.
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Tsuyoshi Arakawa, Ken-ichi Takada, Yoshikazu Tsunemine, Jiro Shiokawa
1986 Volume 15 Issue 6 Pages
875-878
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The detection of CO gas was studied using LaCoO
3−x as a sensing material which was obtained by reduction of LaCoO
3 in a hydrogen atmosphere at 500 °C. LaCoO
3−x exhibits the change of the resistivity at low temperatures in the presence of hydrogen and has a sensitivity-temperature profile with a maximum at about 100 °C. CO adsorption causes a decrease in the resistivity of LaCoO
3−x as in the case of O
2 adsorption although LaCoO
3−x is a p-type semiconductor.
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Masayoshi Ando, Hiroshi Ohhara, Kahei Takase
1986 Volume 15 Issue 6 Pages
879-882
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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An efficient and practical method for the stereospecific synthesis of olefins from vicinal diols via the corresponding 2-methoxy-1,3-dioxolanes is reported.
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Douglas J. De Young, Robert West
1986 Volume 15 Issue 6 Pages
883-884
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Tetramesityldisilene and
trans-1,2-di-
t-butyl-1,2-dimesityldisilene (
3) react with various 1-alkynes to give air-stable disilacyclobutenes. The cycloaddition of
3 to alkynes produces equal amounts of both stereoisomers, consistent with a stepwise mechanism.
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Hideaki Hamada, Mahesh G. Samant, Michel Boudart
1986 Volume 15 Issue 6 Pages
885-888
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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X-Ray absorption spectroscopy (XAS) studies at the L
III absorption edge of Ir and the K absorption edge of Ru were conducted on silica-supported Ir–Ru samples. The samples were prepared by co-impregnation of silica with an aqueous solution of IrCl
4 and RuCl
3. The XAS data indicate segregation of an Ir–Ru alloy on the surface of the Ir particles. The L
III absorption threshold resonance associated with the Ir atom suggests that Ir in Ir/SiO
2 and Ir–Ru/SiO
2 is more electron deficient than bulk metallic Ir powder.
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Yoshitaka Tatsuno, Akihiko Sekiya, Kazuhide Tani, Taro Saito
1986 Volume 15 Issue 6 Pages
889-892
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The effects of metals, substituents on porphyrin and axial ligands on the metalloporphyrin-catalyzed epoxidation of cyclohexene with iodosobenzene were examined. The results suggested that the oxo ligand in the ferryl porphyrin intermediate functions as an electrophile to olefins.
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Mitsunori Hashimoto, Yutaka Eda, Yasutomo Osanai, Toshiaki Iwai, Seiic ...
1986 Volume 15 Issue 6 Pages
893-896
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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In the presence of a catalytic amount of 2-cyclohexen-1-one, decarboxylation of α-amino acids proceeds smoothly and affords the corresponding amino compounds in good yields. Optically active amino compounds, (3
R)-(−)-3-hydroxypyrrolidine and (2
R)-(−)-2-hydroxypropylamine are obtained in 93% and 80% yields, respectively.
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Yoshio Hori, Katsuhei Kikuchi, Akira Murata, Shin Suzuki
1986 Volume 15 Issue 6 Pages
897-898
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The electrochemical reduction of CO
2 was studied with galvanostatic (5 mA cm
−2) electrolysis at a copper electrode between 0 and 40 °C. The production of CH
4 and C
2H
4 was confirmed by GC with 4 different columns. The faradaic efficiency of CH
4 formation was about 65% at 0 °C and dropped with an increase of temperature, whereas that of C
2H
4 formation rose to ca. 20% at 40 °C.
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Masahiro Hiramoto, Kazuhito Hashimoto, Tadayoshi Sakata
1986 Volume 15 Issue 6 Pages
899-902
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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By making use of a photolithography technique, mosaic coating composed of thick metal films and a transparent silicon oxide film was applied to the surface of the small bandgap semiconducting electrodes such as Si electrodes with a p-n junction (p
+ n-Si) or an MIS junction (MIS-Si), n-CdS/p-CdTe heterojunction electrodes. These electrodes are stable and evolve oxygen efficiently with visible light in concentrated alkaline solutions.
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Kiyoshi Otsuka, Qin Liu, Masaharu Hatano, Akira Morikawa
1986 Volume 15 Issue 6 Pages
903-906
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The synthesis of ethylene directly from methane has been tested in the presence of oxygen over the LiCl-added transition metal oxides. The oxides of Mn and Ni with LiCl produced ethylene with high selectivity (ca. 60%) and yield (ca. 27%) under the following experimental conditions: T=1023 K, P(CH
4)/P(O
2)=2/1, P(CH
4)=5.1 kPa, and W/F=600–1200 g l
−1s.
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Manabu Fujiwara, Hisanobu Wakita, Isao Masuda, Takayuki Matsushita, To ...
1986 Volume 15 Issue 6 Pages
907-910
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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18- and 22-membered tetraaza macrocycles were prepared from acetylacetone and 1,4-diaminobutane or 1,6-diaminohexane, respectively. Their copper(II) complexes were characterized by electronic spectroscopy and the copper(II) complex of the 18-membered macrocycle was found to be pseudo-tetrahedral.
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Siriwan Taechachoonhakit, Piniti Ratananukul
1986 Volume 15 Issue 6 Pages
911-912
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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An efficient method for the synthesis of d,1-muscone has been developed.
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Zheng-Zhong Lin, Toshio Okuhara, Makoto Misono
1986 Volume 15 Issue 6 Pages
913-914
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Ru particles dispersed on Al
2O
3 were characterized by TEM, XRD, and H
2 adsorption. It was shown that, after reduction by H
2, Ru particles were aggregates of fine particles, and by oxidation and subsequent reduction they changed to large single crystallites of Ru. This change affected significantly the selectivity of CO hydrogenation in contrast to previous reports obtained for Ru/Al
2O
3 pretreated only by H
2.
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Teruaki Mukaiyama, Hiroshi Suzuki, Tohru Yamada
1986 Volume 15 Issue 6 Pages
915-918
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The diastereoselective addition of the Sn(II) enolates derived from carboxylic thioesters to α-iminoester is described. The Sn(II) enolates of t-butylthiol esters react smoothly with α-iminoester to afford the corresponding β-aminoacid derivatives in good yield with high diastereoselectivity.
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Takashi Tatsumi, Atsushi Muramatsu, Tetsuya Fukunaga, Hiro-o Tominaga
1986 Volume 15 Issue 6 Pages
919-920
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The Addition of Ni to Mo–KCl/SiO
2 enhanced alcohol production from CO–H
2 reaction, in improving a selectivity for C
2+ alcohols. The production of PrOH increased by adding C
2H
4 to the CO–H
2 mixture, which suggests that CO insersion into a metal-alkyl like bond constitutes the reaction pathway to alcohols.
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Masamichi Fujihira, Toshinari Araki
1986 Volume 15 Issue 6 Pages
921-922
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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An in situ cyclic voltammetric measurement of anthraquinone (AQ) moieties in the monolayer assembly spread on water was carried out by horizontal touching with a glassy carbon disk electrode (GC) under various surface pressures. Some unexpected findings on the reactivity of the AQ film in a low surface pressure, which cannot be transferred to the electrode surface as it is on water by other methods than the horizontal touching method, are described.
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Koichiro Naemura, Takanori Fujii, Hiroaki Chikamatsu
1986 Volume 15 Issue 6 Pages
923-926
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Horse liver alcohol dehydrogenase-catalyzed reduction of
meso-diketone: pentacyclo[5.4.0.0
2,6.0
3,10.0
5,9]undecane-8,11-dione gave (−)-11-hydroxypentacyclo[5.4.0.0
2,6.0
3,10.0
5,9]undecan-8-one which was transformed to (+)-D
3-trishomocuban-4-ol. HLADH also catalyzed the reduction of (±)-pentacyclo[5.4.0.0
2,6.0
3,10.0
5,9]undecan-8-one (
4) affording (+)-
4 and (−)-pentacyclo[5.4.0.0
2,6.0
3,10.0
5,9]undecan-8-ol.
View full abstract
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Hitoshi Kinoshita, Takeshi Ohnuma, Takeshi Oishi, Yoshio Ban
1986 Volume 15 Issue 6 Pages
927-930
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The new acylating agents [PhS(O)–CH=C(OMe)Cl and the corresponding sulfone] were proved to be useful for indroduction of an acetyl group into the α-position of the carbonyl group by means of two-carbon Michael acceptors, which was successfully applied to a total synthesis of (±)-aspidofractinine.
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Yoshiyuki Kobayashi, Hiroaki Hayashi, Koji Miyaji, Shohei Inoue
1986 Volume 15 Issue 6 Pages
931-934
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Transcyanohydrination, the reaction between an aldehyde and acetone cyanohydrin to give the cyanohydrin of the aldehyde, catalyzed by cyclo((S)-phenylalanyl-(S)-histidyl) gives the product with optical yield up to 63% from some aromatic and aliphatic aldehydes. The reaction catalyzed by (S)-α-dimethylamino-ε-caprolactam gives the product with optical yield of 15-25% from aliphatic aldehydes.
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Shinzi Kato, Yukio Komatsu, Toshiaki Murai, Hiro-o Hamaguchi, Mitsuo T ...
1986 Volume 15 Issue 6 Pages
935-938
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The Raman spectrum of benzoylsulfenyl iodide in ether has been observed for the first time using a high-speed multi-channel Raman spectrometer. The S–I stretching frequency is found to be 387 cm
−1, which is useful for the characterization of organosulfur compounds involving the S–I linkage.
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Kazuo Miyamura, Masahiko Saburi, Yohichi Gohshi, Sei Tsuboyama, Toshio ...
1986 Volume 15 Issue 6 Pages
939-942
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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An optically active tetra-aza macrocycle was prepared by a simple method, employing an optically active N-substituted diamine as a starting material, and the molecular structure of its nickel(II) complex was determined by an X-ray crystallographic analysis.
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Hidefumi Hirai, Keiichiro Wada, Makoto Komiyama
1986 Volume 15 Issue 6 Pages
943-946
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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A novel adsorbent of carbon monoxide is prepared by stirring 15.0 mmol of copper(II) chloride and 10.0 g of active carbon in water, followed by removal of the liquid phase at 0.06 mmHg, 180 °C. The adsorbent rapidly adsorbs carbon monoxide from 9:1 carbon monoxide-helium mixture under 1 atm at 20 °C, and the equilibrium amount of adsorbed carbon monoxide is 10.0 mmol.
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Tsukio Ohtani, Toshiyuki Yamaoka, Koji Shimamura
1986 Volume 15 Issue 6 Pages
947-950
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The in situ observations of the gaseous species in the closed-tube chemical transport systems, V
2O
3–TeCl
4, V
5O
9–TeCl
4, VO
2–TeCl
4, V
6O
13–TeCl
4, and V
2O
5–TeCl
4 were made by using an UV and VIS spectrophotometer which was improved for the high-temperature measurements. The measurements showed that a great majority of gaseous species in the transport tube is VOCl
3 for all the systems, which is in agreement with the earlier result of the mass spectrometry on the VO
2–TeCl
4 system.
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Masaaki Iwata, Hiroyoshi Kuzuhara
1986 Volume 15 Issue 6 Pages
951-952
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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N-Alkylphtalimides were transformed to
N-alkylformamides, mediated by hydrazine hydrate in
N,
N-dimethylformamide, in practical synthetic yields.
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Shigeo Tazuke, Yasushi Miyamoto, Tomiki Ikeda, Kouzou Tachibana
1986 Volume 15 Issue 6 Pages
953-956
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Photoisomerization(intramolecular photodimerization) of the title compound(I) proceeded enantioselectively in the matrix(II). The rate of reaction of the
l-isomer is over 20% faster than that of the
d-isomer. Induced circular dichroism(ICD) of I due to II matrix increased very much([Θ]>10
6) with the progress of the reaction. The origin of enantioselectivity was discussed in relation to the change in ICD.
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Reizo Kato, Hayao Kobayashi, Akiko Kobayashi, Yutaka Nishio, Koji Kaji ...
1986 Volume 15 Issue 6 Pages
957-960
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Electrochemical crystallization with the use of a mixed supporting electrolyte gave θ-(BEDT-TTF)
2(I
3)
1−x(A)
x (A=AuI
2 and I
2Br), where x is very small but non-zero. When A=AuI
2 (x=0.03) or A=I
2Br (x≅0), the crystals exhibited “partially” superconducting behavior.
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Kaoru Fuji, Manabu Node, Yoshihide Usami
1986 Volume 15 Issue 6 Pages
961-962
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Reactions of 2,2-dimethyl-4-lithio-1,3-oxathiane 3,3-dioxide (
2) with alkyl halides and carbonyl compounds proceed smoothly to give 4-substituted heterocycles. A general synthesis of γ-hydroxyketones from aldehydes utilizing 2 is described.
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Hiroshi Mokita, Ichiro Higasayama, Tsuguo Yamaoka
1986 Volume 15 Issue 6 Pages
963-966
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Photocrosslinking efficiency of bromo- and chloromethylated polystyrene sensitized by 2,4-diisopentylthioxanthone was evaluated in a thin film by measuring the gel fraction of the polymer irradiated with UV(λ>330 nm) light. By the application of an external magnetic field of 70 mT, the gel fraction increases and photocrosslinking efficiency is enhanced by ≈36%.
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Tsuneo Imamoto, Hiroyasu Koto
1986 Volume 15 Issue 6 Pages
967-968
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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New trivalent iodine reagents possessing chiral center were generated by the reaction of iodosylbenzene with the derivatives of L-tartaric anhydride. The reagents cleanly oxidize prochiral sulfides to optically active sulfoxides with substantial asymmetric induction.
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Kazuhiro Nakasuji, Hideki Yamochi, Ichiro Murata, Noritake Yasuoka, Ma ...
1986 Volume 15 Issue 6 Pages
969-972
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Three intramolecular charge transfer (CT) compounds, which exhibit clear CT transition for symmetry allowed CT interaction, have been synthesized and examined. In addition, a possible way to introduce new type of interstack interactions in the solid state was proposed from the crystal structure of 7,10-ethenocyclohepta-[de]naphthalene-8,9-dicarbonitrile.
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Otohiko Tsuge, Shuji Kanemasa, Masayuki Ohe, Shigeori Takenaka
1986 Volume 15 Issue 6 Pages
973-976
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Decarboxylative condensation of glycine or N-substituted glycines with a variety of carbonyl compounds such as formaldehyde, aromatic aldehyde, or ketones is a convenient and general route to parent methaniminium methylide and its 1-mono- and 1,1-disubstituted derivatives with or without an N-substituent.
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Kazuaki Sasaki, Yoshio Aso, Tetsuo Otsubo, Fumio Ogura
1986 Volume 15 Issue 6 Pages
977-978
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Phenyltellurotrimethylsilane cleanly reacted with acyl chloride, giving tellurol ester in an excellent yield. The high reactivity of tellurol ester toward lithium organocuprate was demonstrated.
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Katsuyoshi Hoshino, Kosaku Suga, Tetsuo Saji
1986 Volume 15 Issue 6 Pages
979-982
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The cyclic voltammetry of a cationic surfactant with ferrocenyl moiety (Fc) in an anionic micellar solution leads to the conclusion that Fc incorporated in the micelle is electrochemically inactive in the absence of electrolytes and active in the presence of electrolytes.
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Yoshio Okamoto, Hideaki Sakamoto, Koichi Hatada, Masahiro Irie
1986 Volume 15 Issue 6 Pages
983-986
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Cellulose tris(4-phenylazophenylcarbamate) (CPAPC) having azobenzene pendant groups was adsorbed on silica gel to use as a chiral stationary phase for HPLC. Pure
trans-CPAPC resolved many racemic compounds, whereas 70%
cis-CPAPC showed very poor resolving power.
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Yoshihiro Nakato, Hiroyuki Yano, Hiroshi Tsubomura
1986 Volume 15 Issue 6 Pages
987-990
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Open-circuit photovoltages (V
oc) of photoelectrochemical cells having an n-Si electrode coated with vacuum-evaporated platinum in an aqueous redox solution have been remarkably increased by etching the Pt-coated n-Si electrode in alkaline solutions. The maximum V
oc obtained was 0.685 V, about 15% higher than that of normal p-n junction Si solar cells (0.59 V), demonstrating the possibility of using these cells as highly efficient solar energy converter. The large increase in V
oc is explained by a theory recently proposed by us on semiconductor electrodes coated with microscopically discontinuous metal layers.
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Kazuo Kasatani, Hiroyasu Sato
1986 Volume 15 Issue 6 Pages
991-994
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Raman spectra of liquid complexes of polyethylene glycols (PEG) with alkali metal salts are characterized by an intense polarized band near 860 cm
−1. This band can be used as a useful monitor of complex formation. It indicates a nearly symmetric ordering of the PEG chain around the metal cation.
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Masato Shoji, Makoto Shimura, Hiroshi Ogino, Tasuku Ito
1986 Volume 15 Issue 6 Pages
995-998
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The complexes, [Cr(CHCl
2)(acac)
2L] (L = H
2O, CH
3OH, and pyridine), were prepared, where acac
− denotes 2,4-pentanedionate ion. [Cr(CHCl
2)(acac)
2(CH
3OH)] reacts with pyridine(py) rapidly to give [Cr(CHCl
2)(acac)
2(py)]. The structure of [Cr(CHCl
2)-(acac)
2(py)] has been determined to be trans by single crystal X-ray diffraction. The Cr–N(py) bond lengthens to 2.16(1) Å. This may be associated with that rapid substitution reaction.
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Tokiko Uchida, Hisao Seki, Masanori Ito, Chikako K. Nakano, Taketoshi ...
1986 Volume 15 Issue 6 Pages
999-1002
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The crystal structure of two polymorphic forms of phenothiazine-tetrachloroantimonate, triclinic and monoclinic forms, was determined. The monoclinic crystal consists of one-dimensional stacking columns of phenothiazine cation radicals and infinite chains of (SbCl
4−)
n. Its single crystals are semiconductors with an activation energy of 0.3 eV, and possess anisotropic behavior.
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Hiyoshizo Kotsuki, Naka Yoshimura, Yasuyuki Ushio, Tatsuya Ohtsuka, Ma ...
1986 Volume 15 Issue 6 Pages
1003-1004
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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Benzenethiol esters are efficiently reduced to alcohols under mild conditions by treatment with zinc borohydride prepared from zinc chloride and sodium borohydride.
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Hiroshi Takaku, Tsunehiko Ito, Kazuaki Imai
1986 Volume 15 Issue 6 Pages
1005-1008
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
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The 3,4-dimethoxybenzyl group was introduced to the 2′-hydroxyl group by the reaction of nucleosides with 3,4-dimethoxybenzyl trichloroacetimidate or 3,4-dimethoxybenzyl bromide-NaH. Further, this group can be used as a protecting group for the O
6-amide group of the guanine residue. The protected nucleosides are useful starting materials for the synthesis of oligoribonucleotides. The 3,4-dimethoxybenzyl group was removed rapidly from the oligoribonucleotides by treatment with oxidizing agents without any damage to the glycosidic bonds.
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Teruaki Mukaiyama, Hitoshi Nagaoka, Masahiro Ohshima, Masahiro Murakam ...
1986 Volume 15 Issue 6 Pages
1009-1012
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
JOURNAL
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In the presence of a catalytic amount of trityl perchlorate, secondary and tertiary allyl methyl ethers smoothly react with silyl enol ethers to afford the corresponding γ,δ-unsaturated carbonyl compounds in good yields. By the combination of this reaction with the trityl perchlorate catalyzed allylation of acetals γ,δ-unsaturated ketones are synthesized from α,β-unsaturated acetals by a one-pot procedure.
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Noritsugu Yamasaki, Masahiro Murakami, Teruaki Mukaiyama
1986 Volume 15 Issue 6 Pages
1013-1016
Published: June 05, 1986
Released on J-STAGE: March 27, 2006
JOURNAL
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Tin(II) carboxylic thioester enolates, formed in situ from stannous 2-methyl-2-propanethiolate and ketenes, react with imines in the presence of stannous triflate to give the corresponding β-aminocarboxylic thioesters in an
anti-selective manner. This method is successfully applied to a diastereoselective synthesis of a carbapenem antibiotic PS-5 intermediate.
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