Abstract
Нydrolytic polycondensation of organochlorosilanes (OCS) RR´SiCl2, where R,R´= Me, Et, C2H3, and H, in an acetone—carbamide non-aqueous system was studied. It was found by GLC, GPC, 29Si NMR spectroscopy, mass spectrometry, and elemental analysis that linear and cyclic oligoorganosiloxanes were formed in a quantitative yield as a result of hydrolysis. The mechanism of the process includes conjugate mutually dependent reactions: (i) generation of water via dehydrocondensation of acetone and carbamide involving HCl and (ii) hydrolysis of OCS to form HCl. This determines the cascade character of the overall process. The hydrolysis of OCS in the system studied develops with autoacceleration like branched cascade processes because of peculiarities of stoichiometry of the dehydrocondensation of acetone and carbamide.
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Dedicated to Academician of the Russian Academy of Sciences V. M. Novotortsev on the occasion of his 70th anniversary.
Based on the materials of the XIII Andrianov Conference "Organosilicon Compounds: Synthesis, Properties, and Application" (to the 110th anniversary of Academician К. А. Andrianov, June 28—July 1, 2015, Moscow).
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 0767—0773, March, 2016.
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Zavin, B.G., Trankina, E.S., Kondrashova, A.A. et al. Cascade synthesis of polyorganosiloxanes in an organodichlorosilane—acetone—carbamide non-aqueous system. Russ Chem Bull 65, 767–773 (2016). https://doi.org/10.1007/s11172-016-1371-6
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DOI: https://doi.org/10.1007/s11172-016-1371-6