作者:John M. Brown、Stephen A. Hall
DOI:10.1016/0022-328x(85)87378-2
日期:1985.4
The stereochemistry of hydrogenation of a range of unsaturated cyclohexanecarboxylic acids and their esters has been investigated, employing either bis(1,4-diphenylphosphino)butanerhodium or pyridine(tricyclohexylphosphine)iridium based cationic catalysts in CH2Cl2. For methyl 3-methylcyclohex-2-enecarboxylate, highly selective reduction to the trans-product was achieved in both cases, whereas the
已经研究了一系列不饱和环己烷羧酸及其酯的氢化立体化学,采用基于CH 2 Cl 2的双(1,4-二苯基膦基)丁铵或吡啶(三环己基膦基)铱基阳离子催化剂。对于3-甲基环己-2-烯甲酸甲酯,在两种情况下都实现了对反式产物的高度选择性还原,而异构体3-亚甲基环己烷甲酸甲酯给出了相当数量的顺式异构体。在相当慢的反应中,在还原4-甲基环己-3-烯丙基羧酸甲酯方面也获得了反式异构体的优势。D 2的还原 揭示了在氢化过程中发生了烯烃双键的相当大的异构化。