LYLE, T. A.;MEREYALA, H. B.;PASCUAL, A.;FREI, B., HELV. CHIM. ACTA, 1984, 67, N 3, 774-788
作者:LYLE, T. A.、MEREYALA, H. B.、PASCUAL, A.、FREI, B.
DOI:——
日期:——
Photochemical reactions, 135th communication Photochemistry of Homoconjugated Cyclobutanones. II. Decisive Effect ofgem- Dimethyl Substitution on the Course of the Oxa-di-?-methane Rearrangement
作者:Terry A. Lyle、Hari Babu Mereyala、Alfons Pascual、Bruno Frei
DOI:10.1002/hlca.19840670319
日期:1984.5.2
The synthesis and photolysis of the spirocyclobutanones 4–7 incorporating a cyclohexa-, cyclohepta- and cyclooctadiene moiety, respectively, is described. On triplet excitation, these compounds undergo isomerization via a 1,2-acyl shift involving one or both double bonds of the diene system. The presence of a gem-dimethyl group as in 1, 4 and 7 dramatically changes the photoproduct distribution, since