“Constrained geometry” catalysts of the rare-earth metals for the hydrosilylation of olefins
摘要:
A series of yttrium and lutetium alkyl complexes [Ln(eta(5)-C(5)Me(4)ZNR'-kappa N)(CH2SiMe3)(THF)(n)] (Ln = Y, Lu) was prepared by reacting the tris(trimethylsilylmethyl) precursor [Ln(CH2SiMe3)(3)(THF)(2)] with different linked amino-cyclopentadienes of the type (C5Me4H)ZNHR' (Z = SiMe2, CH2SiMe2; R'= tBu, Ph, C6H4-tBu-4, C6H4-nBu-4). The catalytic activity of these alkyl complexes in the hydrosilylation of 1-decene and styrene using PhSiH3 as reagent was examined under standard conditions. A significant influence of the ligand structure on the catalytic property (turnover frequency, regioselectivity) was observed with the yttrium. complex [Y(eta(5)-C(5)Me(4)CH(2)SiMe(2)NtBu-kappa N)(CH2SiMe3)(THF)] being the most active for 1-decene hydrosilylation. (c) 2006 Elsevier B.V. All rights reserved.