Strained Metallastannoxanes-Ring-Opening Polymerization versus Retention of Six-Membered-Ring Structure

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• 作者：Jens Beckmann ; Klaus Jurkschat ; Ulrich Kaltenbrunner ; Nicole Pieper ; and Markus Schü ; rmann
• 刊名：Organometallics
• 出版年：1999
• 出版时间：April 26, 1999
• 年：1999
• 卷：18
• 期：9
• 页码：1586 - 1595
• 全文大小：290K
• 年卷期：v.18,no.9(April 26, 1999)
• ISSN：1520-6041

文摘

The synthesis is reported of the novel stannasiloxanes cyclo-M(OSiPh₂)₂O (1, M =Sn[(CH₂)₃NMe₂]₂; 2, M = Sn[(CH₂)₃N(Me)CH₂]₂; 4, M = Sn[Cp(CO)₂Fe]₂; 5, M = Sn[Cp(CO)₃W]₂; 6, M = Sn(t-Bu)[Cp(CO)₃W]) and cyclo-(Ph₂SiOSnR₂O)₂ (3, R = (CH₂)₃NMe₂), andof the stannagermoxane cyclo-t-Bu₂Sn(OGePh₂)₂O (7). The molecular structures are describedof 1-4, 6, and 7. The compounds exhibit reduced ring strain as a result of eitherintramolecular Sn-N coordination (1, 2) or electronic influence of the transition-metalfragments (4-6), and consequently they are six-membered rings in solution as well as inthe solid state, whereas compound 3 is an eight-membered ring.