Charge-transfer spectra of a series of substituted silacyclopentenes and some related carbon analogues were measured in the visible region in dichloromethane solution. Tetracyanoethylene was used as an electron acceptor with the aim of proving stereoelectronic requirements of hyperconjugation. The changes of veT with substitution at silicon are greater in cyclopentenylsilanes, in which the (HC-Si) bond is in a conformation ...
