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S$_H$2 Reaction on Silicon-Carbon Bond in the Photoreactions of 2, 3-Benzo-1, 1-diphenyl(or dimethyl)-1-sila-2-cyclobutene with Carbonyl Compounds

  • Kang, Kyung-Tai (Department of Chemical Education, College of Education, Busan National University) ;
  • Okazaki, Renji (Department of Chemistry, Faculty of Science, The University of Tokyo) ;
  • Inamoto, Naoki (Department of Chemistry, Faculty of Science, The University of Tokyo)
  • Published : 1984.02.20

Abstract

The photoreaction of 2, 3-benzo-1, 1-diphenyl (or dimethyl)-1-sila-2-cyclobutene (9 or 10) with an aldehyde or ketone results in 1:1 cycloadduct of [4 + 2] type. In the reactions of 2, 3-benzo-1, 1-dimethyl-1-sila-2-cyclobutene (10) with acetone and butanone, another 1:1 adducts (13) were also formed, respectively. The following facts indicate that the formation of adduct involves an attack of a triplet carbonyl compound on the silicon of the benzosilacyclobutene, an $S_H2$ process. (1) Even when the reaction of 9 with acetophenone was carried out under conditions such that more than 99% of incident light was absorbed only by acetophenone using the filter solution of aq. cupric sulfate, the same adduct was still formed. (2) When the reaction of 9 with acetone was carried out under oxygen atmosphere, only trace amount of adduct was formed.

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References

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