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5442375 
Journal Article 
PREPARATION OF 3-METHYLENESILACYCLOBUTANE AND ITS USE IN ORGANIC-SYNTHESIS 
Okada, K; Matsumoto, K; Oshima, K; Utimoto, K 
1995 
1 
Tetrahedron Letters
ISSN: 0040-4039
EISSN: 1873-3581 
36 
44 
8067-8070 
WOS:A1995TB63900032 
Treatment of 3-methylene-1,1-diphenylsilacyclobutane (1a) with dihalo-melhyllithium provided ring expanded 2-halo-4-methylenesilacyclopentane. Heating a mixture of 1a and carbonyl compound such as PhCHO or PhCOMe at reflux in 1,2-dichloroethane afforded 5 methylene 1,1 diphenyl-2-oxa-1-silacyclohexane which was converted into 3-methylene-1,5-alkanediol monomethyl ether upon treatment with dimethyl acelal in the presence of Lewis acid catalyst. Treatment of ketoaldehyde (PhCOCH2CHO) with 1a under BF3· OEt2 catalysis gave 3-methylene-1-phenyl-8 oxabicyclo[3.2.1]octane in one pot