Hydrosilylation Catalysis by C2-Symmetric Bis(silylamido) Complexes of Yttrium
作者： Tomislav I. Gountchev , T. Don Tilley
DOI: 10.1021/OM990690J
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摘要: The yttrium hydride {[DADMB]YH(THF)}2 (2; DADMB = 2,2‘-bis(tert-butyldimethylsilylamido)-6,6‘-dimethylbiphenyl), conveniently generated in situ from [DADMB]YMe(THF)2 (1), is an active olefin hydrosilylation catalyst. This system represents the first use of a d0 metal complex with non-Cp ligands catalytic olefins. Studies reactivity and regio- enantioselectivity for various olefins silanes are presented. High preference terminal addition case aliphatic observed, while aromatic exhibit 2,1-addition. Both primary secondary have been employed. Preliminary studies chiral catalyst show that 90% ee can be achieved norbornene PhSiH3. Kinetic support mechanism consistent generally accepted one catalyzed by early transition species, involving rapid insertion into Y−H bond followed Si−C bond-form...
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