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Oxo-Bridged Bis(group 4 metal unsymmetric phosphonium-stabilized carbene) Complexes
J.-Y. Guo, Y.-C. Chan, Y. Li, , C.-W. So
Published in American Chemical Society
2015
Volume: 34
   
Issue: 7
Pages: 1238 - 1244
Abstract
The synthesis and reactivity of oxo-bridged bis(group 4 metal unsymmetric phosphonium-stabilized carbene) complexes are described. The reaction of [CH2RNRS] (1; RN = PPh2NSiMe3, RS = PPh2S) with 1 equiv of [M(NMe2)4] (M = Zr, Hf) afforded the group 4 metal unsymmetric phosphonium-stabilized carbene complexes [M(NMe2)2(CRNRS)] (M = Zr (4), Hf (5)). Their reactions with water in toluene afforded the oxo-bridged derivatives O[M(NMe2)(CRNRS)]2 (M = Zr (6), Hf (7)). Compound 6 underwent an insertion reaction with AdNCO to form O[Zr{OC(NMe2)NAd}(CRNRS)]2 (8; Ad = adamantyl). Compounds 4-8 were characterized by NMR spectroscopy and X-ray crystallography. (Chemical Presented). © 2015 American Chemical Society.
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Published in American Chemical Society
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