Insights into the making of a stable silylene |
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Authors: | Gehrhus Barbara Hitchcock Peter B Pongtavornpinyo Ruti Zhang Lihong |
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Institution: | Department of Chemistry, School of Life Sciences, University of Sussex, Brighton, UKBN1 9QJ. |
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Abstract: | Reduction of Cl2Si(NR)2C6H4-1,2] (R = CH2Bu(t)) with potassium is known to lead to the stable silylene Si(NR)2C6H4-1,2] (1). However, silylene is now shown to react further with an alkali metal (Na or K) to yield the (1)(2)2-, c-(1)(3)-*, c-(1)(3)2- or c-(1)(4)2- derivatives. Reduction of Cl2Si(NR)2C6H4-1,2] (R = CH2CH3 or CH2CHMe2) with potassium does not lead to an isolable silylene, but such a silylene is proposed to be an intermediate and, as for 1, reacts further to afford the potassium salts of c-Si{(NR)2C6H4-1,2}]4-* and c-Si{(NR)2C6H4-1,2}](4)2-. The pathways leading to the anionic cyclotri- and cyclotetrasilanes are discussed and supported experimentally; including by X-ray structures of relevant intermediates. |
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