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Yasutoshi Umehara

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Publication

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Journal of The Chemical Society, Chemical Communications | 1980

Photocyclization reaction and triplet lifetime of hindered o-alkyl benzophenones

Yoshikatsu Ito; Yasutoshi Umehara; Yutaka Yamada; Teruo Matsuura

The triplet lifetimes of hindered 4′-substituted-2,4,6-tri-isopropylbenzophenones decrease (increase) with the increasing electron-donating (withdrawing) ability of the ring substituents; this is the opposite effect to that expected from the rate of the intermolecular hydrogen-abstraction reaction of unhindered benzophenones.

Journal of the American Chemical Society | 1983

Photoinduced reaction. 142. Intramolecular hydrogen abstraction from triplet states of 2,4,6-triisopropylbenzophenones: importance of hindered rotation in excited states

Yoshikatsu Ito; Hiroaki Nishimura; Yasutoshi Umehara; Yutaka Yamada; Mutsuto Tone; Teruo Matsuura

Bulletin of the Chemical Society of Japan | 1980

Formation of ketone diperoxides from ozonation of O-methyloximes.

Yoshikatsu Ito; Hiroaki Yokoya; Yasutoshi Umehara; Teruo Matsuura

Journal of the American Chemical Society | 1980

Sterically promoted benzocyclobutenol formation from 2,4,6-triisopropylbenzophenone photolysis

Yoshikatsu Ito; Yasutoshi Umehara; Toyoto Hijiya; Yutaka Yamada; Teruo Matsuura

Journal of Organic Chemistry | 1981

Photoinduced reactions. 132. Hindered rotation in 2,4,6-triisopropylbenzophenones

Yoshikatsu Ito; Yasutoshi Umehara; Koichi Nakamura; Yutaka Yamada; Teruo Matsuura; Fumio Imashiro

Bulletin of the Chemical Society of Japan | 1982

Thermochemical Studies on 2,4,6-Triisopropylbenzophenone and Its Photo-isomer, 3′,5′-Diisopropyl-4,4-dimethyl-3-phenyl-1,2-benzocyclobuten-3-ol. Evaluation of Magnitude of Light Energy Stored in the Latter Molecule

Sadayasu Inagaki; Shigeo Murata; Minoru Sakiyama; Yoshikatsu Ito; Yasutoshi Umehara; Toyoto Hijiya; Teruo Matsuura

Chemistry Letters | 1980

LASER-PHOTOLYSIS STUDY OF BIRADICAL FORMATION FROM THE TRIPLET STATE OF 2,4,6-TRIISOPROPYLBENZOPHENONE

Hisaharu Hayashi; Saburo Nagakura; Yoshikatsu Ito; Yasutoshi Umehara; Teruo Matsuura

ChemInform | 1980

FORMATION OF KETONE DIPEROXIDES FROM OZONIZATION OF O-METHYLOXIMES

Yoshikatsu Ito; Hiroaki Yokoya; Yasutoshi Umehara; Teruo Matsuura

ChemInform | 1983

PHOTOINDUCED REACTION. 142. INTRAMOLECULAR HYDROGEN ABSTRACTION FROM TRIPLET STATES OF 2,4,6-TRIISOPROPYLBENZOPHENONES: IMPORTANCE OF HINDERED ROTATION IN EXCITED STATES

Yoshikatsu Ito; H. Nishimura; Yasutoshi Umehara; Yutaka Yamada; M. Tone; Teruo Matsuura

ChemInform | 1982

PHOTOINDUCED REACTIONS. 132. HINDERED ROTATION IN 2,4,6-TRIISOPROPYLBENZOPHENONES

Yoshikatsu Ito; Yasutoshi Umehara; Koichi Nakamura; Yutaka Yamada; Teruo Matsuura; F. Imashiro

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Teruo Matsuura

Ryukoku University

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Yoshikatsu Ito

Kyoto University

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Yutaka Yamada

Nihon University

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Koichi Nakamura

Kyoto University

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Hisaharu Hayashi

Osaka University

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Minoru Sakiyama

Osaka University

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Saburo Nagakura

University of Tokyo

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Shigeo Murata

Osaka University

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Toyoto Hijiya

Ajinomoto

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