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Dive into the research topics where Masahiro Minabe is active.

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Featured researches published by Masahiro Minabe.


Tetrahedron | 1979

Some reactions of stable ozonide derived from 4H-cyclopenta[def]phenanthrene

Masaaki Yoshida; A. Kadokura; Masahiro Minabe; Kazuo Suzuki

Abstract The ozonization of 4H-cyclopenta[def]phenanthrene gave exclusively a stable monomeric ozonide in a pure crystalline state. Reduction of the ozonide afforded the corresponding dialdehyde, diol, and lactone by treatment with triphenylphosphine, lithium aluminium hydride, and sodium sulfite, respectively. Photo-irradiation of the ozonide converted it into an acid anhydride. The corresponding aldehyde acid was obtained by pyrolysis of the ozonide.


Kobunshi Ronbunshu | 1997

Studies on Polymers Containing a Five-Membered Lactone Unit in Main Chain. IV. Synthesis and Properties of Polyamides Containing a Five-Membered Lactone Unit in Main Chain from Aromatic Diamines.

Takao Kimura; Takato Kimura; Masahiro Minabe

主鎖に五員環ラクトンを含む芳香族系ポリアミド (PA-PhL) の構造と性質を明らかにする目的で, o-, m-, およびp-体のフェニレンジアミンを用いて (2R*, 4S*) -4-クロロホルミル-2-クロロホルミルメチル-2, 4-ジメチル-4-ブタノリドの重縮合を行った. 溶媒にテトラヒドロフラン (THF) を用いて溶液法で行ったとき, 生成するPA-PhLの収率はp-体が最も高く, 還元粘度はo-< m-<p-体の順に増加した. ヘキサメチレンジアミンを用いて調製した脂肪族系ポリアミド (PA-6L) と異なり, PA-PhLはいずれもラクトン部位の開環を伴わずに生成し, 二酸クロリドに対して3当量のアニリンを用いて行ったモデル反応でもラクトン部位の開環は起こらず, ジアミドが選択的に得られた. PA-6Lはメタノールに可溶であったが, PA-PhLはメタノールに溶解性を示さず, 含水率も低かった. しかしアルカリ処理によりラクトン部位の可逆的な開環が起こり, 水溶性を示した. またPA-PhLのガラス転移温度と分解開始温度はいずれもm-<o-<p-体の順に高くなる傾向を示した.


Bulletin of the Chemical Society of Japan | 1994

Electrophilic Substitution of Monosubstituted Pyrenes

Masahiro Minabe; Shouji Takeshige; Yuuji Soeda; Takao Kimura; Motohiro Tsubota


Tetrahedron Letters | 2011

Novel synthesis of oxa[9]helicenes by Lawesson’s reagent-mediated cyclization of helical quinone derivatives

Mohammad Salim; Akira Akutsu; Takao Kimura; Masahiro Minabe; Michinori Karikomi


Journal of Organic Chemistry | 1975

Fluorene derivatives. XXXI. Stable rotamers of 9,9':9',9''-terfluorenyls at room temperature

Masahiro Minabe; Kazuo Suzuki


Polymer Degradation and Stability | 2004

Effect of organic peroxides on the thermal decomposition of expanded polystyrene with the addition of α-methylstyrene

Feng Xue; Daisuke Takeda; Takao Kimura; Masahiro Minabe


Journal of Organic Chemistry | 1976

Clemmensen reduction of 2-acetylfluorene. Pathways for the formation of 2,3-di(2-fluorenyl)butane and its homologues

Masahiro Minabe; Masaaki Yoshida; Minoru. Fujimoto; Kazuo Suzuki


Heterocycles | 1987

Reactions of Diphenylcyclopropenone with Hydrazine Derivatives: Formation of Pyrazolone Derivatives via 3-Aminocinnamohydrazides

Takashi Toda; Masaaki Yoshida; Tetsuo Katayama; Masahiro Minabe


Bulletin of the Chemical Society of Japan | 1983

Synthesis of 4H-cyclopenta(def)phenanthrene from fluorene skeleton.

Masaaki Yoshida; Masahiro Minabe; Kazuo Suzuki


Journal of Organic Chemistry | 1979

Electrophilic substitution of 4H-cyclopenta[def]phenanthrene. Bromination

Masaaki Yoshida; Seikichi Nagayama; Masahiro Minabe; Kazuo Suzuki

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Kazuo Suzuki

St. Vincent's Health System

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Toru Oba

Utsunomiya University

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Feng Xue

Utsunomiya University

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