作者:James M Blackwell、Darryl J Morrison、Warren E Piers
DOI:10.1016/s0040-4020(02)00974-2
日期:2002.10
β-carbon, 1,4 addition of silane is very clean; in other instances, 1,2 hydrosilation is competitive. The reaction is facile with five commercially available silane reagents. For two examples, a novel hydrosilation of the resulting silylenol ethers was also observed. The net trans stereochemistry of H–Si addition to the silylenol ether CC bond was established and points to a stepwise mechanism for this
描述了由B(C 6 F 5)3(1-2%)催化的各种简单的α,β-不饱和烯酮的1,4氢化硅烷化。对于在β-碳附近没有空间位阻的底物,添加1,4硅烷是非常干净的。在其他情况下,1,2硅氢化反应具有竞争力。该反应易于使用五种可商购的硅烷试剂进行。对于两个实施例,还观察到了所得的甲硅烷基醚的新型硅氢化。建立了甲硅烷基醚CC键中H-Si的净反式立体化学,并指出了该反应的逐步机理。甲硅烷基碳离子中间体与[HB(C 6 F5)3 ] -来自4,4-二甲基-2-环己烯-1-酮和PhMe 2 SiH的甲硅烷基醚的硅氢化反应中的抗衡阴离子。