Comparison of cationic rhodium and iridium complexes in directed homogeneous hydrogenation
作者:John M. Brown、Stephen A. Hall
DOI:10.1016/s0040-4020(01)82359-0
日期:1985.1
The hydrogenation of endo-6-methylenebicyclo[2,2,2]octan-2-ol catalysed by a range of rhodium and iridium complexes has been investigated. Unlike the corresponding exo-alcohol, reduction is highly stereoselective leading to 95 – 99.7% of endo-exo-6-methylbicyclo[2,2,2]octan-2-ol. Selectivity is much less pronounced for the corresponding methyl ether. Rhodium catalysts promote a competitive isomerisation
已研究了由一系列铑和铱配合物催化的内-6-亚甲基双环[2,2,2] octan-2-ol的氢化反应。与相应的异醇不同,还原反应具有很高的立体选择性,可导致95- 99.7%的内异6甲基双环[2,2,2]辛烷-2-醇。对于相应的甲基醚,选择性没有那么明显。铑催化剂促进双键竞争性异构化为内基6-甲基-双环[2,2,2] oct-5-en-2-ol,其中真实的样品以高收率还原为纯的外切-内切产品。铱络合物对两种内羟基底物的还原都是快速且高度选择性的。