Generation and capture of alkylchlorosilanones

Article abstract of DOI:10.1007/BF02494689

Alkyltrichlorosilanes react with DMSO (molar ratio 1 : 1, 0 °C) to give cyclic oligoalkylchlorosiloxanes of the general formula [R(Cl)SiO]_n (where R = Me or Et; n = 3-6). With an excess of alkyltrichlorosilane (2 : 1), linear oligoalkylchlorosiloxanes Cl[R(Cl)SiO]_mSiCl₂R (where R = Me or Et; m = 1-5) are also formed. In the presence of hexamethyldisiloxane (molar ratio Cl₃SiR : DMSO : (Me₃Si)₂O = 1 : 1 : 2, 20 °C), the reaction products are both cyclic and linear oligoalkyl(trimethylsilyloxy)siloxanes [R(Me₃SiO)SiO]_n (n = 3-5) and Me₃Si[OSi(OSiMe₃)R]_mOSiMe₃ (m = 1-3), respectively. The reaction of DMSO with trichloro(vinyl)silane and hexamethyldisiloxane occurs in a similar manner. A plausible scheme of formation of the final products via intermediate alkylchlorosilanones RClSi=O and alkyl(trimethylsilyloxy)silanones is discussed.