Journal issue
Volume 7
, Issue 1
Showing 1-40 articles out of 40 articles from the selected issue
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Katsuma Hiraki, Yoshio Fuchita, Shigeki Morinaga1978 Volume 7 Issue 1 Pages 1-2
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESScis-[PdCl2(PPh2R)(CN–C6H4–CH3–p)] (R=Ph or Et) reacted with nitrilimines, derived from N-phenylarylcarbohydrazonyl chlorides and triethylamine, to afford novel cyclic carbene-palladium(II) complexes, cis-[PdCl2(PPh2R){CN(C6H4–CH3–p)C(C6H4–R′−p)=N-NPh}].View full abstract -
Keiji Yamamoto, Akira Tomita, Jiro Tsuji1978 Volume 7 Issue 1 Pages 3-6
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSOptically active aminophosphines were prepared via ortho-directed metalation of appropriate arylamines followed by introduction of a diphenylphosphino group. These aminophosphines were used as ligands in the rhodium complex-catalyzed asymmetric hydrogenation of itaconic acid. Although moderate optical yields (up to 43% ee) were obtained, the stereochemical outcome with each ligand depended markedly on the chelate effect of the aminophosphines which played a significant role in both catalytic activity and enantioselectivity.View full abstract -
Hisashi Ito, Keiichi Ogawa, Iwao Ichikizaki1978 Volume 7 Issue 1 Pages 7-8
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSA polymeric nitrophenylsulfenyl chloride(5) was synthesized and used for amino protection during peptide synthesis. The insoluble protecting group can be selectively removed from the amino derivative with mild acid treatment similarly to o-nitrophenylsulfenyl(Nps) group, and the separation is quite easy due to its insolubility. When the protected derivative is treated with hydrogen chloride for deprotection, the polymeric reagent(5) is regenerated so that it can be used for amino protection repeatedly.View full abstract -
Kaoru Harada, Isao Nakamura1978 Volume 7 Issue 1 Pages 9-10
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSThe reaction of α-methylbenzylamine with dimethyl meso and racemic dibromosuccinate resulted in the formation of trans-aziridine(Ib) and Schiff base(III) of dimethyl oxaloacetate. The optically active III was hydrogenated and hydrogenolyzed to form optically active aspartic acid(V). The optical purity of V reached up to 49 %.View full abstract -
Takuya Yamashita, Akira Shibata, Shinsuke Yamashita1978 Volume 7 Issue 1 Pages 11-12
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSIn relation to the structure of water at the interfacial region, the effects of monovalent anions on the surface pressure-area curves of poly-ε-benzyloxycarbonyl-L-lysine were investigated. The effects of anions on increasing the surface pressure were in the order of SCN−> Br−> Cl−> F− in accordance with that of these anions as breakers of water structure.View full abstract -
Masanori Kosugi, Tomiya Shimizu, Toshihiko Migita1978 Volume 7 Issue 1 Pages 13-14
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSAryl bromide and iodide were found to react with aliphatic and aromatic thiolate anions to give the corresponding sulfides in the presence of Pd(O). The reaction was not inhibited by p-dinitrobenzene which is a good inhibitor for the SRN1.View full abstract -
Ilsong Rhee, Membo Ryang, Hideo Hasegawa, Shinji Murai, Noboru Sonoda1978 Volume 7 Issue 1 Pages 15-16
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSReaction of aroyl- or alkenoylnickel carbonyl halide complexes, derived from the reaction of organohalides with nickel carbonyl, with olefin oxides afforded halohydrin esters.View full abstract -
Hiroshi Horino, Takashi Ito, Akio Yamamoto1978 Volume 7 Issue 1 Pages 17-20
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSA self-condensation of aldehydes to yield esters is catalyzed by ruthenium complexes under mild conditions without appreciable side reactions. The reaction is applicable to both aliphatic and aromatic aldehydes, and the ruthenium complexes proved to be particularly active catalysts among other transition metal complexes examined.View full abstract -
Akira Kasahara, Taeko Izumi1978 Volume 7 Issue 1 Pages 21-24
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESS[2,2] Ferrocenophane-1,13-diene (1) was synthesized via the intermolecular coupling of ferrocene-1,1′-dicarbaldehyde (2) with TiCl4–LiAlH4. The catalytic hydrogenation of 1 led to the formation of [2,2] ferrocenophane (7). An alternate approach to the synthesis of 7, involving the reductive coupling of 1,1′-bis(hydroxymethyl)ferrocene with TiCl4–LiAlH4 is described.View full abstract -
Yoshiaki Inamoto, Koji Aigami, Yoshiaki Fujikura, Motoyoshi Ohsugi, Na ...1978 Volume 7 Issue 1 Pages 25-28
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSBromination of tricyclo[4.3.1.12,5]undecane (3) gave exclusively the 1-bromo derivative (5). The structure of 5 was determined unequivocally by making use of deuterium isotope effects on 13C NMR signals of 1-deuterio-3 (6) derived from 5 and 10,10-dideuterio-3 (4) prepared from the dideuterated alcohol 2.View full abstract -
Hisanobu Ogoshi, Hiroshi Sugimoto, Takahiro Nishiguchi, Tsutomu Watana ...1978 Volume 7 Issue 1 Pages 29-32
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESS5-Aryl- and 5,15-diaryl-2,3,7,8,12,13,17,18-octaethylporphines were prepared with high selectivity by the condensation of bis-(3,4-diethylpyrryl)methane with aromatic aldehydes by varying acidic media.View full abstract -
Yo Miyagi, Kazuo Kitamura, Kazuhiro Maruyama, Yuan Lang Chow1978 Volume 7 Issue 1 Pages 33-36
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSUpon irradiation 2-acyl-1,4-quinones (I) underwent a regiospecific condensation to give their dimers, polycyclic compounds (II). An alternative structure (II′), though it is compatible with the NMR spectra of the dimers, was excluded on the basis of converting one of the dimers to a 9,10-phenanthrenequinone derivative (IV). No condensation of I with dienophiles occurred.View full abstract -
Makoto Kajiwara, Satoru Mihara, Kohzo Yudate, Taku Matsuo1978 Volume 7 Issue 1 Pages 37-40
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSFluorescence spectra of cationic surfactants, with a phenoxy group as a part of the molecular structure, were studied. On the formation of the micelles, luminescences with energy lower than that of the monomer were observed, and it was taken to indicate the presence of interactions involving photoexcited phenoxy group aligned in the micellar interior.View full abstract -
Toyonobu Asao, Shigeyasu Kuroda, Kazuo Kato1978 Volume 7 Issue 1 Pages 41-44
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESS1-Formylcycloheptatriene was obtained by Vilsmeier reaction as novel direct substitution of cycloheptatriene accompanying bitropyl. Reduction, Grignard reaction and condensation reaction of the formyl compound were investigated.View full abstract -
Sigero Oishi, Naoko Furuta1978 Volume 7 Issue 1 Pages 45-48
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSLinear Stern–Volmer plots were obtained for cathodic photocurrents from the quenching of excited tris(2,2′-bypyridyl)ruthenium(II) with bromonitromethane at an SnO2 electrode, and the resulting Ksv was in fair agreement with that for emission quenching, indicating that the quenching process occurs by the reductive cleavage of bromonitromethane. A nitromethylated product was formed in the presence of 1,4-dimethoxybenzene.View full abstract -
Teruaki Mukaiyama, Yoshiaki Echigo1978 Volume 7 Issue 1 Pages 49-50
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSTreatment of α-hydroxycarboxylic acids with 2-chloro-3-ethylbenzoxazolium tetrafluoroborate and triethylamine at room temperature affords ketones in good yields.View full abstract -
Renji Okazaki, Fumio Ishii, Kazuhiko Sunagawa, Naoki Inamoto1978 Volume 7 Issue 1 Pages 51-54
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSReaction of o-thioquinone methide (1, R1=R2=CH3) with 2-dimethylamino-3-methyl-1-butene afforded a head-to-tail [4+4] dimer of 1 (2b, R1=R2=CH3). Photoreaction of naphtho [2,3-c] [1,2]dithiole-3-thione with cyclohexene is also described.View full abstract -
Renji Okazaki, Kyung-Tae Kang, Kazuhiko Sunagava, Naoki Inamoto1978 Volume 7 Issue 1 Pages 55-56
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSo-Thioquinone methide reacted with maleonitrile, fumaronitrile, methyl vinyl ketone, and acrylamide to give [4+2] cycloadducts. The former two reactions proceeded stereospecifically and the latter two regioselectively. The mode of these reactions are compared with those of the reactions with an enamine and of dimerization.View full abstract -
Hiromitsu Masada, Yutaka Oishi1978 Volume 7 Issue 1 Pages 57-58
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSAryl t-butyl ethers were prepared in high yields by O-alkylations of phenols with t-butyl halides in the presence of pyridine or aliphatic amines for a few hours at 20–30 °C.View full abstract -
Akikazu Kakehi, Suketaka Ito, Toshiake Maeda, Ryoichi Takeda, Masao Ni ...1978 Volume 7 Issue 1 Pages 59-60
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSThe thermolyses of 2-allylidene-1-ethoxycarbonylmethyl-1,2-dihydropyridines gave the corresponding 3-ethoxycarbonylindolizine with elimination of methylene compounds, and their reactions with acetic anhydride afforded 2-acetoxy-1-ethenylindolizines.View full abstract -
Akira Tai, Motomasa Imaida, Toshihiko Oda, Hiroshi Watanabe1978 Volume 7 Issue 1 Pages 61-64
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSSynthesis of optically active 3,7-dimethylpentadecan-2-ol (1), a common precursor of sex pheromone of pine sawflies, was carried out. (+)-(2S,3S)-, (−)-(2R,3R)-, and (±)-(2R*, 3S*)-1 were prepared from (+)-(2R, 3S)-, (−)-(2S, 3R)-, and (±)-(2R*, 3S*)-3-hydroxy-2-methylbutyric acid, respectively under the conservation of their stereochemistry. Enantioface-differentiating (asymmetric) hydrogenation of methyl 2-methyl-3-oxobutyrate over tartaric acid-modified nickel catalyst gave methyl 3-hydroxy-2-methylbutyrate in high diastereomer and enantiomer excess, enabling us to obtain the optically active starting materials in high yields.View full abstract -
Atsuyoshi Ohno, Hiroyuki Yamamoto, Tadashi Okamoto, Shinzaburo Oka, Yu ...1978 Volume 7 Issue 1 Pages 65-68
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSKinetic (kH/kD) and product (YH/YD) isotope effects have been studied for the reduction of α,α,α-trifluoroacetophenone with 1-propyl-1,4-dihydronicotinamide in acetonitrile in the presence or absence of magnesium perchlorate. It is concluded that the magnesium ion catalyzes the initial electron-transfer process of the reduction.View full abstract -
Tatsuya Shono, Yoshihiro Matsumura, Shigenori Kashimura1978 Volume 7 Issue 1 Pages 69-72
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSA facile method of the transformation of esters to vinyl compounds was developed by using the electroreductive 1,2-elimination as a key step. β-Hydroxysulfones were electrochemically reduced to vinyl compounds in good yields. Hydroxyolefins could be also prepared from the corresponding lactones.View full abstract -
Youzi Hori, Yoshiaki Nagano, Hideaki Uchiyama, Yoshio Yamada, Hiroshi ...1978 Volume 7 Issue 1 Pages 73-76
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSThe DBU-BrCCl3 reagent has been found to be an excellent reagent for bromination of active hydrogen compounds. The resulted bromides further afford dibromides and/or olefins in the case of active methylene compounds by controlling the reaction conditions.View full abstract -
Toshihiro Kamada, Osamu Yamamoto1978 Volume 7 Issue 1 Pages 77-80
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSTautomers of the titled β-ketoester, both keto (1) and enol (2), are obtained, which are unusually stable in the solid state as well as in solution. NMR studies revealed that 1 exists as an equi-librium mixture of axial-boat (ab) and equatorial-boat (eb) conformers in solution, whereas 2 exists in only one conformation.View full abstract -
Norio Miura, Noboru Yamazoe, Tetsuro Seiyama1978 Volume 7 Issue 1 Pages 81-82
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSA new thermochemical water-splitting process named “Sb–I–Ca Process” is proposed with relevant thermochemical data and preliminary experimental results. The process consists of basic steps of five reactions and three phase-transitions, each of which proceeds to an acceptable extent. The overall efficiency is estimated to be ca.50 % with an assumption of 70 % heat recovery.View full abstract -
Hiroshi Bandow, Takaharu Onishi, Kenzi Tamaru1978 Volume 7 Issue 1 Pages 83-86
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSBased on the IR spectroscopic study of the reaction products between iron vapor and nitric oxide, which can be regarded as a model of chemisorbed species, the IR absorption bands of nitric oxide adsorbed on iron at 1800 and 1720 cm−1 are attributed to adsorbed species on oxidized and metallic iron, respectivelyView full abstract -
Masayuki Matsumoto, Kazuo Amaya1978 Volume 7 Issue 1 Pages 87-88
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSThe heats of solution of aminoacids crystals at 298.15 K have been measured. The difference between the heat of solution of optically active compounds and that of corresponding racemic compounds was appreciably large compared with the heat of mixing of concentrated aqueous solutions of D- and L-optical isomers, and the values were several kJ/mol at most.View full abstract -
Tatsuaki Yamaguchi, Ryuji Miyagawa1978 Volume 7 Issue 1 Pages 89-92
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSThe initial hydrogen absorption rate of the methanolic solution of isolated pyridinecobaloxime was measured manometrically at 30°C. The rate dependence on the cobaloxime concentration was varied with excess pyridine added to the solution. The results gave the mechanistic elucidation for the hydrogen absorption process.View full abstract -
Masao Tsukada, Itaru Omura1978 Volume 7 Issue 1 Pages 93-94
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSStudies were made on the quenching of the benzene fluorescence excited with 254 nm radiation by pyrimidine in cyclohexane. The value of quenching constant is larger by a factor of 7 than that expected for diffusion-controlled process.View full abstract -
Haruo Matsuda, Hideo Shinohara1978 Volume 7 Issue 1 Pages 95-98
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSReactions of 1-X-2-chloropropanes (X=CH3O–, HO– and CH3OCO–) with benzene catalyzed by AlCl3 have been studied. The former two secondary chlorides gave unusual products, n-propylbenzene and 1,1-diphenyl-1-propene, in addition to 1-X-2-phenylpropane, 1,1- and 1,2-diphenylpropanes, respectively, whereas the other one afforded only methyl 3-phenylbutanoate.View full abstract -
Masamitsu Ochi, Hiyoshizo Kotsuki, Hiroaki Ishida, Takashi Tokoroyama1978 Volume 7 Issue 1 Pages 99-102
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSBecause sendanin is an artifact which has been isolated from M. azedarach Linn. var. japonica Makino only after the acetylation of crude limonoid fraction, the structure of the natural hydroxyl precursor was studied. The chemical and spectroscopic evidence revealed that it was an epimeric mixture of the hemiacetal 5.View full abstract -
Masaru Shiraki, Masahiko Yoshiura, Keiji Iriyama1978 Volume 7 Issue 1 Pages 103-104
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSA thin-layer chromatographic method for the analysis of leaf pigments and their derivatives by commercial silica gel layers has been developed. The method is rapid and easy and is suitable for checking the purity of chlorophyll samples for various investigation.View full abstract -
Takashi Matsumoto, Shuji Usui1978 Volume 7 Issue 1 Pages 105-108
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSThe chirality of asymmetric centers of pallescensin-1 (1a), -2 (2a), and -A (4a) was respectively assigned to be (R), (R), and (5S,10S) by the syntheses of la and 4a starting from (R)-(−)-α-cyclocitral (5a).View full abstract -
Yuzo Yoshikawa1978 Volume 7 Issue 1 Pages 109-112
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSThe conformational analysis of the meso and two racemic isomers of [Co(hexaen)]3+ (Fig. 1) has been carried out and their energy-minimized structures have been determined. Based on these results, the isolation of the three isomers was achieved.View full abstract -
Tadashi Sasaki, Akihiro Kondo1978 Volume 7 Issue 1 Pages 113-114
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSReaction of tricyclo[4.2.2.02,5]deca-3,7-diene derivatives 1 or 2 with DMSO-conc.HCl gave transannular methylthiolactonization product 3 and 3-chloro-4-methylthiotricyclo[4.2.2.02,5]dec-7-ene derivatives 4. Reaction of 1 or 2 with HBF4 in DMSO resulted in the protonation of the cyclohexene double bond. These results have been interpreted as the result of the orbital interaction of electrophile′s LUMO and olefin′s HOMO.View full abstract -
Hideyuki Matsumoto, Taichi Nakano, Toshimi Nikaido, Yoichiro Nagai1978 Volume 7 Issue 1 Pages 115-116
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSAddition of carbon tetrachloride to conjugated 1,3-dienes such as 1,3-butadiene, 1,3-pentadiene, isoprene, 1,3-cyclohexadiene and 1,3-cyclooctadiene proceeded smoothly under mild conditions in the presence of dichlorotris(triphenylphosphine)ruthenium(II) to give the corresponding 1,4-addition products as 1:1 adducts in excellent yields.View full abstract -
Katsuma Hiraki, Masayoshi Onishi, Kazutoshi Hamada, Hitoshi Ogata1978 Volume 7 Issue 1 Pages 117-118
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSA new Schiff base, N,N′,N″-1,3,4-neopentanetriyltris(4-imino-2-pentanone) was prepared from acetylacetone and 1,1,1-tris(aminomethyl)ethane. This Schiff base served as a trivalent sexadentate N3O3 ligand, which formed mononuclear six-coordinated neutral complexes with Co(III) and Fe(III) ions.View full abstract -
Mitsuo Masaki, Satoshi Matsunami, Kiyomi Okimoto, Hideo Ueda1978 Volume 7 Issue 1 Pages 119-122
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSAcetatotrichloro(triphenylphosphine oxide)tin(IV) was synthesized by the reaction of stannic chloride, acetic acid and triphenylphosphine oxide or by the reaction of dichlorotin(IV) diacetate with tetrachlorobis(triphenylphosphine oxide)tin(IV). The structure of the complex was determined by the X-ray method. The molecule is monomeric and tin atom is six-coordinated.View full abstract -
Yukio Kubota, Kouji Hirano, Yuko Motoda1978 Volume 7 Issue 1 Pages 123-126
Published: January 05, 1978
Released: March 27, 2006
JOURNAL FREE ACCESSThe analysis of fluorescence quantum yields reveals that bound proflavine does not fluoresce unless it is intercalated between two adjacent AT pairs. The results of 9-aminoacridine suggest that two adjacent AT pairs next to GC pairs may be still quenching sites for the dye or the heterogeneity of the dye binding may occur.View full abstract
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