-
Tohru Yamada, Toshihiro Takai, Oliver Rhode, Teruaki Mukaiyama
1991 Volume 20 Issue 1 Pages
1-4
Published: 1991
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In the presence of a catalytic amount of a bis(1,3-diketonato)nickel(II) complex, trisubstituted and
exo-terminal olefins or norbornene analogues are smoothly monooxygenated into the corresponding epoxides in high to quantitative yields on treatment with aldehyde under an atmospheric pressure of oxygen at room temperature.
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Tohru Yamada, Oliver Rhode, Toshihiro Takai, Teruaki Mukaiyama
1991 Volume 20 Issue 1 Pages
5-8
Published: 1991
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The oxidation of aldehydes into the corresponding carboxylic acids using a catalytic amount of nickel(II) complex under an oxygen atmosphere at room temperature is described. Bis[1,3-di(
p-methoxyphenyl)-1,3-propanedionato]nickel(II)(Ni(dmp)
2) behaves as an excellent catalyst for the oxidation of aldehydes to afford the corresponding carboxylic acids in good yields.
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Naoki Sugimoto, Atsushi Tanaka, Yuki Shintani, Muneo Sasaki
1991 Volume 20 Issue 1 Pages
9-12
Published: 1991
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The effect of ethidium (ED) on the double-helix melting of octamers of deoxyriboadenylic and deoxyribothymidylic acids (dA
8 and dT
8) in a phosphate buffer containing 1 mol dm
−3 NaCl has been studied quantitatively. The results indicate that the enthalpy and entropy changes for the dA
8·dT
8 melting in the presence of ED are much larger than those in the absence of the drug; that is, ED increases the stability of the duplex.
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Nobuhito Imanaka, Takeshi Kawasato, Gin-ya Adachi
1991 Volume 20 Issue 1 Pages
13-16
Published: 1991
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Selective CO
2 sensing was examined with CO
2 sensor based on a lithium ionic conductor, LiTi
2(PO
4)
3 + 0.2Li
3PO
4. The CO
2 detectability was little influenced with NO
2 coexistence in the atmosphere. The sensor could also detect the CO
2 concentration selectively in the atmosphere where the SO
2 content was smaller than approximately 20 ppm. In the case of CH
4 coexistence, the total sum of the primary CO
2 and CO
2 formed from the CH
4 oxidation, was obtained with the sensor.
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Ken-ichi Sato, Shogo Sakuma, Yutaka Nakamura, Juji Yoshimura, Hironobu ...
1991 Volume 20 Issue 1 Pages
17-20
Published: 1991
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Seven novel methyl-branched 2,3,4,5-tetrahydroxycyclohexanone derivatives were prepared in good yields by Ferrier reaction via corresponding key intermediates: 6-deoxyhex-5-enopyranosides.
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Yasushi Saotome, Takeo Miyazawa, Takeshi 1 Endo
1991 Volume 20 Issue 1 Pages
21-24
Published: 1991
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Novel water-insoluble polymers, which are degraded and solubilized by the action of specific proteolytic enzymes, were successfully synthesized from α-amino acid, 1,2-ethanediol, and adipic acid.
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Yo Shimizu, Masaru Miya, Akira Nagata, Kazuchika Ohta, Ayao Matsumura, ...
1991 Volume 20 Issue 1 Pages
25-28
Published: 1991
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The title compound was found to exhibit two phases between the isotropic liquid and crystalline ones. The phase transition enthalpies and entropies were typical for those of discotic mesogens, though the two phases are highly viscous but not brittle. The X-ray diffraction study indicated the two phases have discotic lamellar structures with slight difference each other.
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Toyonari Sugimoto, Kaoru Ikeda, Jun Yamauchi
1991 Volume 20 Issue 1 Pages
29-32
Published: 1991
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Trimethylenemethanes substituted with three ethylenedithio or 1,2-benzodithio groups were generated by electrochemical reduction of the corresponding dication salts, and investigated by ESR. For the latter diradical the triplet ESR spectrum was observed and the temperature dependence of the signal intensity established the ground triplet state. The ESR spectrum of the former diradical could not be detected because of its high reactivity so as to allow ring-closure to the methylenecyclopropane.
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Minoru Suzuki, Hidemasa Kondo, Isao Tanaka
1991 Volume 20 Issue 1 Pages
33-34
Published: 1991
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The absolute stereochemistry of okamurallene and the related metabolites, unusual C
15 nonterpenoid bromoallenes from the red alga
Laurencia intricata Lamouroux, were established by X-ray crystallographic analysis as well as chemical and spectral evidence.
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Yuichi Shimizu, Shun’ichi Sugimoto, Shunichi Kawanishi, Nobutake ...
1991 Volume 20 Issue 1 Pages
35-36
Published: 1991
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Butanediols and acetaldehyde were directly synthesized by KrF-laser irradiation of the N
2-saturated ethanol (EtOH) containing H
2O
2.
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Toshiya Okajima, Zhen-He Wang, Yoshimasa Fukazawa
1991 Volume 20 Issue 1 Pages
37-40
Published: 1991
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Conformational analysis of the title compound using an X-ray diffraction, molecular mechanics and ring current calculations is presented. The chair type structure found in its crystalline state is almost identical to that of its dithia analogue. However, the structure in solution is quite different from its crystalline structure.
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Baldev Singh, Allan G. Hlavac
1991 Volume 20 Issue 1 Pages
41-42
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N,
N-Dimethylformamide dimethyl acetal is converted to tetramethylammonium salts upon treatment with 5-methyl-4-isoxazolecarboxylic acid derivatives.
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Katsuhiko Tomooka, Shih-Yi Wei, Takeshi Nakai
1991 Volume 20 Issue 1 Pages
43-46
Published: 1991
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The
E/
Z stereoselection in the acyclic oxy-Cope rearrangement of stereochemically-defined 3-methyl-1,5-heptadien-4-ols, prepared via diastereoselective [2,3]Wittig variants, has been evaluated, thereby permitting to propose a reasonable transition-state model for this type of anionic oxy-Cope variant.
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Munehiro Nakatani, Tsunao Hase
1991 Volume 20 Issue 1 Pages
47-48
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The absolute configuration of the asymmetric carbon (C-2) of methyl 2-hydroxysterculate was determined as
R by applying the dibenzoate chirality method.
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Yoshikazu Hiraga, Shunsuke Izumi, Toshifumi Hirata, Takayuki Suga
1991 Volume 20 Issue 1 Pages
49-52
Published: 1991
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Regloseleetively deuteriated (3
R)-(−)-[8,8,8-
2H
3] linalool was synthesized from (4
R)-(−)-4-acetyl-3-methyl-5-hexenal, which was prepared from (3
R)-(−)-linalyl acetate, with the synthesis of (2
E,6
R)-(−)-2,6-dimethyl-2,7-[1,1-
2H
2]octadiene-1,6-diol as the key step.
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Yaeko Gotoh, Mihoko Yamashita, Masato Nakamura, Naoki Toshima, Hidefum ...
1991 Volume 20 Issue 1 Pages
53-56
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Coisotactic parameters of two steps in a propagating process, one from styrene (St) unit to methyl methacrylate (MMA) unit and the other from MMA unit to St unit, were experimentally determined in alternating copolymerization of MMA with St under the copolymerization conditions giving highly coheterotactic poly(MMA-
alt-St). The former step resulted in highly syndiotactic addition and the latter, in highly isotactic addition.
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Manabu Node, Xiao-jiang Hao, Kaoru Fuji
1991 Volume 20 Issue 1 Pages
57-60
Published: 1991
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A chiral total synthesis of (−)-physostigmine via (−)-eserethole has been achieved starting from (
S)-(−)-2-methyl-2-(2′-nitrovinyl)-δ-valerolactone.
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Minoru Hatanaka, Ikuo Ueda
1991 Volume 20 Issue 1 Pages
61-64
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A concise synthesis of the
N-acyl derivatives of L-daunosamine and L-acosamine is achieved using the highly stereoselective enolate-imine condensation of the lithium dianion of
t-butyl
S-(+)-3-hydroxybutanoate with
N-acylaldimine.
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Hu Huang, Fumiaki Kai, Yoshifumi Asai, Masaaki Hirohata, Masaaki Nakam ...
1991 Volume 20 Issue 1 Pages
65-68
Published: 1991
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A novel complex [Ni
4(pahqs)
4(H
2O)
4]·20H
2O was synthesized and characterized by X-ray crystallography. Except one N atom in each azo group, all the other donor atoms in the ligand were fully used in coordination to Ni(II), and the four Ni(II) were bridged by O atoms in the hydroxyquinoline moieties.
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Yosuke Nakamura, Noboru Koga, Hiizu Iwamura
1991 Volume 20 Issue 1 Pages
69-72
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A ferrocene derivative carrying a nitronyl-nitroxide radical was synthesized and its CT salt with DDQ was prepared. There are two S = 1/2 spins, ferrocenium ion and nitronyl-nitroxide radical, on the cationic part of the CT-salt. From the temperature dependence of magnetic susceptibility data it is concluded that the interaction between them is antiferromagnetic (2
J ≈ −50 cm
−1).
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Shinya Honda, Masaru Shiraki, Shinichi Ohashi, Hatsuho Uedaira
1991 Volume 20 Issue 1 Pages
73-76
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It was proved that a negative charge on acidic lipid was indispensable for the interaction between human growth hormone-releasing factor fragment (hGRF(1–29)NH
2) and lipid. The characteristic conformational changes of the peptide were observed by CD spectroscopy on addition of several acidic lipids, whereas such changes were not observed on addition of neutral lipids.
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Akira Mori, Ryuko Nimura, Hitoshi Takeshita
1991 Volume 20 Issue 1 Pages
77-80
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New 2-(4-alkoxybenzoyloxy)-5-alkylaminotropone liquid crystals, which exhibited the smectic C phase exclusively, were prepared. The FT-IR spectra of 2-(4-dodecyloxybenzoyloxy)-5-octadecylaminotropone at various temperatures indicated that the intermolecular hydrogen bonding between the NH and the tropone C=O groups assists the appearance of the smectic C phase.
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Tatsuya Shono, Tetsuhiro Fujita, Yoshihiro Matsumura
1991 Volume 20 Issue 1 Pages
81-84
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An allyl group was introduced to the α′-position of α-substituted pyrrolidines and the stereoselectivity of the allylation was investigated. High diastereoselectivities were achieved by modifying the α-substituents or the functional groups located at the nitrogen atom of pyrrolidine ring.
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Toshio Itahara, Sunao Koga
1991 Volume 20 Issue 1 Pages
85-88
Published: 1991
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Oxidation of thymidine by KHSO
5 gave thymidine glycols, while a similar treatment with Na
2S
2O
8 gave 5-hydroxymethyl-2′-deoxyuridine.
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Kazuhisa Hiratani, Midori Goto
1991 Volume 20 Issue 1 Pages
89-92
Published: 1991
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A novel clathrate-type inclusion compound has been formed from recrystallization of 2,2-dibutyl-
N,
N′-di(1-naphthyl)malonamide with restricted organic molecules, which was characterized by the thermal analyses (DSC and TGA) and the X-ray structural analysis.
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Takashi Ohmori, Kenji Sakamaki, Kazuhito Hashimoto, Akira Fujishima
1991 Volume 20 Issue 1 Pages
93-96
Published: 1991
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Morphological transformations were observed
ex situ on a palladium (Pd) surface induced by electrochemically absorbed hydrogen using a scanning tunneling microscope (STM). Hydrogenated Pd exhibited β-phase and hydrogen absorption into Pd transformed the surface into a more detailed, nodular-like structure.
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Daiyo Terunuma, Hiroaki Kizaki, Takashi Sato, Koujiro Masuo, Hiroyuki ...
1991 Volume 20 Issue 1 Pages
97-100
Published: 1991
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The reactions of
N-(germylmethyl)benzylamine derivatives with butyllithium were carried out. Facile cleavages of Ge–C bonds of the
N-benzylgermylmethylamine derivatives giving the corresponding germyl anions and
N-pentylbenzylamine were observed. The reaction mechanism of the Ge–C bond cleavage was discussed.
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Jin-ru Li, Ming-hua Liu, Hiroo Nakahara, Masaru Sato, Kiyoshige Fukuda
1991 Volume 20 Issue 1 Pages
101-104
Published: 1991
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With ferrocenyl octadecyl sulfide, stable monolayers on water surface can be obtained by mixing with stearic acid or by oxidizing to the sulfone derivative and can be easily deposited on solid supports to form well-organized LB films, as confirmed by polarized IR spectra and X-ray diffraction. The LB films exhibit electrochemical activity.
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Hitomi Suzuki, Chie Nakaya, Yoshihiro Matano, Takuji Ogawa
1991 Volume 20 Issue 1 Pages
105-108
Published: 1991
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N-Tosyltriarylbismuthimines were prepared by the reaction of triarylbismuthines with chloramine-T and their properties were characterized. These bismuthimines reacted with aromatic aldehydes, acid chlorides, and isocyanates to form
N-arylidenetosylamides,
N-aroyltosylamides, and
N-aryl-
N′-tosylureas, respectively. In the presence of copper catalyst, they readily decomposed into
N-aryl- and
N,
N-diaryltosylamides, tosylamide, and triarylbismuthine.
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Kunio Mochida, Hiromi Chiba, Mitsutoshi Okano
1991 Volume 20 Issue 1 Pages
109-112
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Photolysis of permethylated linear polygermanes, Me(Me
2Ge)
nMe (n = 3–6), proceeds by both the contraction of the chain with loss of dimethylgermylene and the homolytic scission of germanium-germanium bond.
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Shin-ichi Yamamoto, Hiroshi Takeuchi, Yuichiro Tanaka, Kentaro Okuma, ...
1991 Volume 20 Issue 1 Pages
113-116
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Epoxides were converted to the corresponding optically active 2- and 3-hydroxyalkylphosphonium salts by the reaction with triphenylphosphine and dibenzoyltartaric acid (or camphorsulfonic acid), and with methylenetriphenylphosphorane and this acid, followed by fractional recrystallization, respectively. The reaction of oxide ylides derived from these salts with benzaldehyde was carried out.
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Shigeomi Horito, Muneo Tada, Hironobu Hashimoto
1991 Volume 20 Issue 1 Pages
117-120
Published: 1991
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A new method of ketosidation was developed using 4,5:7,8-di-O-isopropylidenated 3-deoxy-D-
manno-2-octulose and its 1-O-protected derivatives as ketosyl donors in the presence of pyridinium
p-toluenesulfonate to afford the α-ketoside exclusively.
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Mitsuo Sekine, Takashi Nakanishi
1991 Volume 20 Issue 1 Pages
121-124
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A new 2′-hydroxyl protecting group, [[2-(methylthio)phenyl]thio]methyl (MPTM), was introduced via a three-step reaction into the 2′-position of uridine and cytidine units required for the synthesis of oligoribonucleotides in the phosphotriester approach. By using these monomer building blocks, CpUpG was synthesized.
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Yves Combret, Jean Jacques Torche, Patrice Binay, Georges Dupas, Jean ...
1991 Volume 20 Issue 1 Pages
125-128
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NADH models with a freely or non freely rotating chiral amide group have been synthesized and used in the reduction of methyl benzoylformate. The same major enantiomer was obtained in all cases. A blocked reagent bearing a phenylalaninol group as chiral auxiliary allows one to obtain a high e.e.
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Kazuko Takahashi, Masashi Ogiyama
1991 Volume 20 Issue 1 Pages
129-132
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The title [3]radialene derivative, 1,2-bis(3,5-di-
t-butyl-4-oxo-2,5-cyclohexadien-1-ylidene)-3-(dibenzo[d,f]-1,3-dioxo-4,6-cycloheptadien-2-ylidene)cyclopropane has been synthesized, and its spectroscopic properties and redox reactions have been investigated. The powerful electron accepting ability of this compound is ascribed to the high electron affinity of the
o-tropoquinone methide residue.
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Jun-ichi Yamaguchi, Yu Takagi, Atsushi Nakayama, Tooru Fujiwara, Takes ...
1991 Volume 20 Issue 1 Pages
133-136
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The tin(IV) chloride promoted coupling reaction of allylstannanes with various arenes proceeded to give the allylated arenes in good yields. It was also found that tin(II) bromide was an effective catalyst for Friedel–Crafts allylation using allylic bromides.
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Takahiko Kojima, Takeshi Usui, Morio Yashiro, Reiko Kuroda, Shigenobu ...
1991 Volume 20 Issue 1 Pages
137-140
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A novel carbinolamine complex, [Co(N-(3,7-diaza-9-aminononyl)-α-amino-α-hydroxymalonato)]
+, was obtained from the reaction of ketomalonic acid and trans-[CoCl
2(2,3,2-tet)]
+ and the molecular structure was determined by X-ray analysis. A free OH group in the carbinolamine linkage had aromatic properties despie it binds to an sp
3 carbon.
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Hisashi Fujihara, Jer-Jye Chiu, Naomichi Furukawa
1991 Volume 20 Issue 1 Pages
141-144
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The oxidative coupling of 2,6-bis(mercaptomethyl)bromobenzene using I
2 gave
syn- and
anti-10,20-dibromo-2,3,12,13-tetrathia[4.4]metacyclophane (
1) which can be isolated in the solid state at room temperature. The sulfur extrusion reaction of
anti-
1with (Et
2N)
3P afforded the corresponding dithia[3.3]metacyclophane, while
syn-
1 gave the trithia[3.4]metacyclophane.
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Atsunori Mori, Shohei Inoue
1991 Volume 20 Issue 1 Pages
145-148
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The addition of a salycylal type Schiff base containing amide,
dl-3-(2-hydroxy-1-naphthylidene)-imino-ε-caprolactam (Nap-ACL) to titanium (IV) 2-propoxide or zirconium (IV) 1-propoxide accelerates cyano group transfers of acetone cyanohydrin with various carbonyl and imino compounds to give the corresponding cyanated products.
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Shizuko Ambe, Shao Yong Chen, Yoshitaka Ohkubo, Yoshio Kobayashi, Masa ...
1991 Volume 20 Issue 1 Pages
149-152
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An irradiation facility and a radiochemical procedure for preparing a radioactive multitracer solution are reported. Gold foil was irradiated with 135 MeV/nucleon
14N-ion beam. The foil was dissolved in aqua regia and precipitation of gold as metal with hydrogen peroxide yielded a carrier- and salt-free multitracer solution.
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Yasushi Saotome, Mitsuru Tashiro, Takeo Miyazawa, Takeshi Endo
1991 Volume 20 Issue 1 Pages
153-154
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Water-insoluble four-component polymers, comprising glycine (Gly), phenylalanine (Phe), 1,2-ethanediol, and adipic acid, were synthesized. These polymers exhibited degrading solubilization upon incubation with chymotrypsin. It was found that the degradation rate of the polymer could be controlled by altering the Phe/Gly ratio.
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Norisuke Hata
1991 Volume 20 Issue 1 Pages
155-158
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The photochemical reactions of 4-methyl-2-quinolinecarbonitrile with (S)- or (R)-2-phenylpropionic acid (
PPCOOH) in benzene were investigated in the absence and in the presence of a magnetic field. The reactions were also examined in polar solvents such as dichloromethane and acetonitrile. The experimental results led to the conclusion that (S)- and (R)-forms of the 2-phenylpropionate ion (
) differ distinctly in their chemical properties.
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Hiroshi Fujitsu, Toshiaki Sakakihara, Isao Mochida
1991 Volume 20 Issue 1 Pages
159-162
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Cobalt-tetrapropoxyphthalocyanine, CoPc(OPr)
4, impregnated with THF onto TiO
2 provided an anion radical (g value: 2.003) which gave a stationary NO(500 ppm) conversion of 27% in a flow reaction without oxygen at 423 K. Oxygen in the reactant gas increased the conversion to 55%, which decreased gradually to the stationary 27% without any formation of NC
2 or CC
2.
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Tadao Sakai, Yun-hua Gao, Noriko Ohno, Nobuo Ura
1991 Volume 20 Issue 1 Pages
163-166
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A selective and rapid spectrophotometric method for the determination of acetylcholine has been developed by flow injection technique coupled with ion pair extraction using tetrabromophenolphthalein ethyl ester dichloroethane solution, where selectivity can be improved by using both higher pH(pH 11) on extraction and thermochromism of ion associates in a flow system.
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Ken-ichi Okamoto, Toshio Semoto, Kazuhiro Tanaka, Hidetoshi Kita
1991 Volume 20 Issue 1 Pages
167-170
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Pervaporation through asymmetric polyimide membranes promoted phenol–acetone condensation catalyzed by cation exchange resin as a result of removal of produced water acting as a catalyst inhibitor. This resulted in a significant improvement of the reaction process.
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Shigero Oishi, Keita Suzuki
1991 Volume 20 Issue 1 Pages
171-172
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Transient spectra were obtained for bis(triphenylphosphine)platinum(0) (ε
410: 630 dm
3 mol
−1 cm
−1), to which O
2 and diphenyacetylene coordinated with second-order rate constants of 2.4 × 10
4 and 1.2 × 10
6 dm
3 mol
−1 s
−1 respectively.
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Yutaka Ukaji, Kouji Kume, Toshiyuki Watai, Tamotsu Fujisawa
1991 Volume 20 Issue 1 Pages
173-176
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Allyl Grignard reagent complexed with cerium trichloride added to chiral (
E)-alkoxymethyl oxime ether, derived from (
S)-2-methoxy-1-phenylethanol, to give the corresponding (
S)-amine stereoselectively, while the imino addition of allyllithium occurred with a preference for the opposite (
R)-isomer. The configuration of the starting oxime ethers was found to greatly influence the diastereofacial discrimination.
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Osamu Kitagawa, Tomohiro Sato, Takeo Taguchi
1991 Volume 20 Issue 1 Pages
177-180
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Iodolactonization of 2-substituted (
N-sulfonylamino, hydroxyl and hydroxymethyl groups)-4-pentenoic acid with NIS or I
2 in the presence of Ti(Oi-Pr)4 gave the γ-lactone with increased 1,3-cis-selectivity. Stereoselectivity in the haloetherification of 2-hydroxymethyl-4-penten-1-ol was reversed by the
addition of Ti(Oi-Pr)4
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Akira Murata, Yoshio Hori
1991 Volume 20 Issue 1 Pages
181-184
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CO
2, not reduced practically at Ni electrodes, was effectively reduced at Ni modified with Cd in aqueous solution, studied by in-situ electrodeposition method. Hydrogen formation is greatly suppressed by deposition of Cd, CO formation becoming predominant. HCOO
−, produced favorably at Cd electrodes, is not appreciably yielded.
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Ryushi Shundo, Ikuzo Nishiguchi, Yoshiharu Matsubara, Manabu Toyoshima ...
1991 Volume 20 Issue 1 Pages
185-188
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Anodic oxidation in a mixed solvent of acetic acid and acetic anhydride containing a variety of styrene derivatives, small amounts of Mn(OAc)
2·4H
2O and Cu(OAc)
2·H
2O brought about a facile carboxymethylation to give the corresponding γ-butyrolactones as the main products in good yields.
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