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Steric effect on photochemistry of benzyl ester derivatives: 2. Effects of substituents and oxygen on photolysis of α-methyl-substituted benzyl alkanoates by Toshiyuki Goshima; Yoshihiro Itoh; Masanobu Kojima; Takashi Karatsu is a Materials Science article available to read on EtoBox.

What is Steric effect on photochemistry of benzyl ester derivatives: 2. Effects of substituents and oxygen on photolysis of α-methyl-substituted benzyl alkanoates about?

The photochemistry of ␣-methyl-substituted benzyl acetates and pivalates, 1a-c and 2a-c, respectively, has been examined in methanol (MeOH). Sensitization and quenching experiments confirmed the predominance of the singlet-state photolysis of these esters. The product distribution depended on methyl groups, on the methylene carbon, and/or alkyl groups attached to the carbonyl group. Ester conversion decreased with methyl substitution. These results are explicable on the basis of steric hindrance, or conformational restriction, around the ester bond. We also found that the photolysis was markedly affected by oxygen, particularly for the most hindered ester 2c. It is likely that the effect of oxygen is attributed to the formation of an excited charge-transfer complex between the esters and an oxygen molecule.

Who reads Steric effect on photochemistry of benzyl ester derivatives: 2. Effects of substituents and oxygen on photolysis of α-methyl-substituted benzyl alkanoates?

Author

Toshiyuki Goshima; Yoshihiro Itoh; Masanobu Kojima; Takashi Karatsu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1010-6030)

Published

1999

Language

EN

Field

Materials Science (Physical Sciences)