Catalytic hydrogenation of aromatic hydrocarbons. Stereochemical definition of the catalytic cycle for .eta.3-C3H5Co(P(OCH3)3)3
作者:J. R. Bleeke、E. L. Muetterties
DOI:10.1021/ja00393a011
日期:1981.2
The eta/sup 3/-C/sub 3/H/sub 5/Co(P(OCH/sub 3/)/sub 3/)/sub 3/-catalyzed hydrogenations with D/sub 2/ of a series of unsaturated organic molecules, including cyclohexenes, cyclohexadienes, and arenes, have been investigated. Complete cis stereoselectivity was observed in the addition of deuterium to the unsaturated ring systems. When alkyl-substituted arenes were reduced with D/sub 2/, the hydrogen
eta/sup 3/-C/sub 3/H/sub 5/Co(P(OCH/sub 3/)/sub 3/)/sub 3/-催化加氢与D/sub 2/一系列不饱和已经研究了有机分子,包括环己烯、环己二烯和芳烃。在向不饱和环系统中加入氘时观察到完全顺式立体选择性。当烷基取代的芳烃用 D/sub 2/ 还原时,只要链中的每个连续碳原子具有至少一个氢原子,烷基链中的氢原子就会发生 HD 交换。因此,广泛的 HD 交换发生在正烷基侧链中,而叔丁基侧链不含氘。当烷基取代的芳烃在烯烃如 1-己烯存在下氢化时,观察到多种异构的烷基环己烯和烯基环己烷。这些异构体物种的相对浓度提供了关于催化循环中(烯烃)钴物种的相对稳定性的信息。从其他竞争性反应,即涉及等摩尔量的两种不同不饱和分子的氢化反应中获得了进一步的机理信息。在对eta/sup 3/-C/sub 8/H/sub 13/Co(P(OCH/sub 3/)/sub