All issues
Volume 46, Issue 10
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Shun-Ichi MURAHASHI, Takeshi NAOTA1988 Volume 46 Issue 10 Pages 930-942
Published: 1988
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSOrganic synthesis using stoichiometric and catalytic amounts of ruthenium compounds are reviewed with an emphasis on the recent progress. The present article surveys on the following subjects, i) hydrogenation, ii) oxidative transformation, iii) isomerization of olefins, iv) nucleophilic addition to carbon-carbon and carbonnitrogen multiple bonds, v) radical reaction, vi) dimerization and condensation reaction, and vii) reaction with carbon monoxide and carbon dioxide.View full abstractDownload PDF (1488K) -
Junji ICHIKAWA, Hiroshi KOBAYASHI, Takaaki SONODA1988 Volume 46 Issue 10 Pages 943-954
Published: 1988
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSTetrakis [3, 5-bis (trifluoromethyl) phenyl] borate (TFPB), a highly lipophilic fluoroaromatic borate ion which is remarkably stable under acid and oxidative conditions, was designed as an anionic phase-transfer catalyst, whose function is to transfer cationic species such as diazonium and oxonium ions in reactive form of ion pair from an aqueous (or solid) phase into a nonpolar organic phase and to promote catalytically the electrophilic reactions in two-phase systems. Some effecive examples of anionic phase-transfer catalysis (PTC) with TFPB were demonstrated in the diazo coupling, the Friedel-Crafts alkylation, the nitrosation (in situ diazo coupling), the acid-mediated hydrolysis of esters, and the redox reactions with methylviologen in liquid membrane system. Kinetic investigations of these PTC reactions clearly indicated that the enhanced reactivities of the cationic species and the specificities of the electrophilic reactions were due to the dehydration of such cationic species ion-paired with TFPB in nonpolar organic phase.View full abstractDownload PDF (1310K) -
Kazuhiro NAKASUJI, Mitsuru SASAKI, Ichiro MURATA1988 Volume 46 Issue 10 Pages 955-969
Published: 1988
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe scientific progresses in the organic molecular metals based on tetrathiafulvalene (TTF) type donors offer three general strategies for molecular design : (1) construction of new multi-stage redox systems, (2) chemical modifications to introduce interstack interactions, and (3) control of degree of charge transfer (CT) According to such strategies, we have recently synthesized peri-condensed Weitz type donors as new multistage redox systems, 3, 10-dithiaperylene (DTPR), 1, 6-dithiapyrene (DTPY), and methylthio and ethylenedithio derivatives of DTPY (MTDTPY, ETDTPY) These new donors produced a variety of CT complexes. An important finding is the realization of organic molecular metals having donors and acceptors outside the TTF and TCNQ (tetracyanoquinodimethane) type components. Not only some physical properties of these new molecular conductors but also some basic features for organic conductors from the organic chemistry point of view are presented.View full abstractDownload PDF (1945K) -
Yoshihiko MORO-OKA, Wataru UEDA1988 Volume 46 Issue 10 Pages 970-976
Published: 1988
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSA novel C-C bond formation to form α, β-unsaturated compounds has been developed by using methanol as a methylenylating agent. Methyl or methylene group at a-position of saturated ketones, esters or nitriles is converted to vinyl group by addition of methanol accompanied by both dehydrogenation and dehydration. The reaction is effectively promoted by magnesium oxide catalysts activated by transition metal cations.View full abstractDownload PDF (758K) -
Keiichi UCHIDA, Hiroki TANAKA1988 Volume 46 Issue 10 Pages 977-985
Published: 1988
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSSome amino acids are synthesized effectively by enzymatic reactions. These enzymatic reactions are also applicable to the synthesis of optically active fluorine-containing amino acids by the use of corresponding fluorine-containing precursors.
This paper describes the following enzymatic reactions. 1) Synthesis of fluorine-containing phenylalanines by transamination of corresponding fluorine-containing phenylpyruvic acids, by phenylalanine ammonia-lyase reaction of fluorine-containing t-cinnamic acids, and by acylase reaction of fluorine-containing N-acetyl phenylalanines, 2) synthesis of fluorotyrosines by β-tyrosinase starting from fluorophenols and serine, 3) synthesis of fluorotryptophan by tryptophanase starting from fluoroindole and serine.View full abstractDownload PDF (956K) -
Shoji KAJIGAESHI, Takaaki KAKINAMI1988 Volume 46 Issue 10 Pages 986-989
Published: 1988
Released on J-STAGE: January 22, 2010
JOURNAL FREE ACCESSBenzyltrimethylammonium tribromide (BTMA Br3), a stable solid brominating agent, can be prepared by the reaction of benzyltrimethylammonium chloride with sodium bromate and hydrobromic acid in aqueous solution. In this article, the useful synthetic applications of BTMA Br3 are described. The reactions of aromatic compounds such as phenols, aromatic amines, aromatic ethers and acetanilides with BTMA Br3 in dichloromethane-methanol at room temperature give easily bromo-substituted products in good yields, respectively. On the reaction of arenes with BTMA Br3, electrophilic.bromination occurs in acetic acid in the presence of zinc chloride, and benzylic brominatlon proceeds in refluxing benzene in the presence of AIBN. Furthermore, BTMA Br3 reacts with acetyl derivatives to give dibromoacetyl derivatives, and with alkenes to give 1, 2-dibromo adducts.View full abstractDownload PDF (411K) -
Haruo SAKAI1988 Volume 46 Issue 10 Pages 990-991
Published: 1988
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESS -
[in Japanese], [in Japanese]1988 Volume 46 Issue 10 Pages 992
Published: 1988
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (116K)
- |<
- <
- 1
- >
- >|