Synthese und Struktur von 3,3-Diorganyl-2,4-dioxa-l,5-dithia- 1,1,5,5-tetraoxid-3-silacyclohexanen und -heptanen / Syntheses and Structure of 3,3-Diorganyl-2,4-dioxa-1,5-dithia-1,1,5,5-tetraoxid- 3-silacyclohexanes and -heptanes

Reactions of di-silver-1,n-alkanedisulfonates 1a (n = 1) and 1b (n = 2) with Cl SiR lead to the monomerie 3,3-diorganyl-2,4-dioxa-1,5-dithia-1,1,5,5-tetraoxid-3-silacyclohexanes (for n = 1) 2a (R = R = Me), 3a (R = Me and R = Ph) and 4a (R = R = Ph) and -heptanes (for n = 2) 2b (R = R = Me), 3b (R = Me and R = Ph) and 4b (R = R = Ph). In the case of 2a-4a a competition reaction is observed leading to the dimerization products 5a (R = Me and R = Me), 6a (R = Me and R = Ph) and 7a (R = Ph and R = Ph). The six-membered ring-systems of 2a-4a are compared with related silanes. An X-ray structure analysis is per­formed for the 3,3-diphenyl-2,4-dioxa-1,5-dithia-1,1,5,5-tetraoxid-3-silacycloheptane (4b).