摘要 : Arylaidehydes can coordinate to nickel(0) in eta(2)-fashion to give eta(2)-arylaldehydenickel complexes. which react with Me3SiOTf or Me3SiCl to give eta(1):eta(1)-siloxybenzylnickel or eta(3)-siloxybenzyl complex. In the presence... 展开 Arylaidehydes can coordinate to nickel(0) in eta(2)-fashion to give eta(2)-arylaldehydenickel complexes. which react with Me3SiOTf or Me3SiCl to give eta(1):eta(1)-siloxybenzylnickel or eta(3)-siloxybenzyl complex. In the presence of PCy3 or CO. Tj I:Tll-siloxvbenzvlnickel complex underwent homocoupling reaction to give a pinacol type product. In the presence of zinc dust. the reductive homocoupling reaction of arylaldehyde proceeded catalytically to form pinacol derivatives in 70-99% yield. On the other hand, eta(3)-siloxybenzylnickel complex regenerated benzaldehyde and Me3SiOTf under a carbon monoxide pressure. (c) 2006 Elsevier Ltd. All rights reserved. 收起