Methyl(vinyl)dichlorosilane reacts with DMSO in the presence of hexamethyldisiloxane to give the corresponding linear oligosiloxanes of the general formula Me3Si(OSiMeVin)(n)OSiMe3 (n = 1-6) as well as MeSi(OSiMe3)(3) and Me3Si(MeOSiVin)(m)OSi(OSiMe3)(Me)OSiMe3 (m = 1-2). The same reaction in the presence of chlorotrimethylsilane results in oligomers of the general formula Me3Si(OSiMeVin)(n)Cl (n = 1-3). A possible scheme of their formation is discussed.
On the synthesis of siloxanes. XXIV. Nucleophilic substitution reactions of 2-functional 1,3-dioxa-2-4,7-trisilacylcloheptanes and 1,3-dioxa-2,4,8-trisilacyclooctanes