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

Y Ito, Y Umehara, K Nakamura, Y Yamada…

Index: Ito, Yoshikatsu; Umehara, Yasutoshi; Nakamura, Koichi; Yamada, Yutaka; Matsuura, Teruo; Imashiro, Fumio Journal of Organic Chemistry, 1981 , vol. 46, # 22 p. 4359 - 4362

Full Text: HTML

Citation Number: 27

Abstract

A variable-temperature NMR study of 4'-substituted 2, 4, 6-triisopropylbenzophenones was performed. With use of the prochiral ortho isopropyl groups as a probe for the dynamic process, activation parameters for the hindered rotation about the single bond linking the 2, 4, 64riisopropylphenyl group and the carbonyl group (the C1-C7 bond) were obtained. A good linear correlation between AG* of rotation and Hammett u+ constants of 4'- ...