✦ LIBER ✦

Solid state photochemistry of methyl-substituted benzophenones

✍ Scribed by Yoshikatsu Ito; Teruo Matsuura; Kenichi Tabata; Meng Ji-Ben; Keiichi Fukuyama; Masanori Sasaki; Shuji Okada

Publisher: Elsevier Science
Year: 1987
Tongue: French
Weight: 469 KB
Volume: 43
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(01)90251-0

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✦ Synopsis

Upon UV irradiation in the solid-state 4.4'-dimethylbenzophenone (la) underwent intermolecular hydrogen abstraction, followed by radical &pling, to give solely a dimeric product, 4-(2-hydroxy-2,2-di-p-tolyleth 1)-4'-methylbenzophenone (2). By contrast, 3.3'-dimethylbenzophenone (lb!. 3.4'-dimethylbenzophenon; (lc) and 4-methylbenzophenone (ll) were photostable under the same condit&. From X-ray crystallographic analysis of 12 and 1-9, the distances betwee bond a e 3.32 A for 0a.H and 3.87 the C=O group and the nearby methyl C-H 2.72) i for O.-H and 4.39 (or 4.53)

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