The reaction of amides RSO2-Pro-NHMe with ClCH2SiMe2Cl in the presence of (Me3Si)2NH gave pentacoordinated chlorosilanes RSO2-Pro-N(Me)CH2SiMe2Cl with an organosulfonyl group (R = Me, Ph, 4-ClC6H4, 4-BrC6H4, 4-MeC6H4, and 4-O2NC6H4) attached to the proline nitrogen atom. An alternative method for the preparation of these compounds comprises the cyclosilylmethylation of proline methylamide by dimethylchloromethylchlorosilane to give the previously unreported heterocyclic 2-sila-5-piperazinone system in the first step. The bicyclic silacyclane synthesized is 2-sila5-piperazinone condensed with a proline residue. The action of sulfonyl chlorides RSO2Cl leads to cleavage of the sila ring Si–N bond to give the desired chlorosilanes. The hydrolysis of these products, depending on the reaction conditions, gives either silyloxonium chlorides [RSO2-ProN(Me)CH2SiMe2OH2]Cl or disiloxanes [RSO2-Pro-N(Me)CH2SiMe2]2O. X-ray diffraction structural analysis showed that the silicon atom in the chlorides and silyloxonium chlorides is pentacoordinated due to an intramolecular O → Si bond and has distorted trigonal-bipyrimidal configuration. 29Si NMR spectroscopy showed that the disiloxanes and bicyclic sila-5-piperazinone have a tetracoordinated silicon atom.
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*Dedicated to the shining memory of our friend, Edmunds Lukevics, whom we knew, appreciated, and loved, a bright, energetic, multifaceted personality, a scientist with a capital S, brilliant leader, highly erudite chemist, who made a definitive contribution to the creation and development of a new area in silicon chemistry, namely, silicon bioorganic chemistry.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1869–1890, December, 2011.
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Nikolin, A.A., Arkhipov, D.E., Shipov, A.G. et al. Pentacoordinated chlorosilanes with C,O-chelate ligands derived from N-methyl-N'-organosulfonyl-prolinamides*. Chem Heterocycl Comp 47, 1565–1583 (2012). https://doi.org/10.1007/s10593-012-0949-7
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DOI: https://doi.org/10.1007/s10593-012-0949-7