Hetero-?-Systeme XVI. Alkoxysilylene (Alkoxysilandiyle)

Article abstract of DOI:10.1016/0022-328X(89)87312-7

Dimethoxysilylene (2) reacts with acetylene or dimethylacetylene to form 1,4-disilacyclohexadienes in very good yields.The known addition reactions of dichloro or dimethylsilylene with olefins cannot be carried out, with the exception of the addition to 2,3-dimethylbutadiene.The UV spectrum of dimethylsilylene is also markedly different from those of alkylsubstituted silylenes.The UV absorptions of matrix-isolated alkoxysilylenes, prepared by thermolytically induced flash extrusion from disilanes or benzosilepines, show a surprisingly large hypsochromic shift.This effect can be correlated with semi-empirical calculations.