Structural Variation Provided by Sulfur, Sulfinyl, and Sulfonyl Groups in Cyclic Silanes and Phosphoranes

Abstract

A series of new monocyclic diorganosilanes were prepared by condensation reactions of the appropriate diorganodichlorosilane with sulfur containing diols.^1-3 The eight-membered rings containing bridging sulfinyl groups² are positioned in anti chair-like conformations which precluded any additional coordination at silicon. This contrasts with silanes having sulfur¹ or sulfonyl³ groups in place of sulfinyl in the ring system where Si–S or Si–O coordination was evident. In these molecules, X-ray studies showed^1,3 that the rings has syn boat-like conformations.