Coordination and Hydrogenation of 1,3-Cyclohexadiene by Niobium and Tantalum Aryl Oxide Compounds: Relevance to Catalytic Arene Hydrogenation

摘要

The sodium amalgam (2 Na per M)reduction of hydrocarbon solutions of the chloro, aryl oxide compounds [M(OC_6H_3Pr_2~ⅰ-2, 6)_2Cl_3]_2 (1) and [M(OC_6H_3Pr_2~ⅰ-2, 6)_3Cl_3](2) (a, M=Nb; b, M=Ta) in the presence of 1, 3- cyclohexadiene leads to formation of the η~4-cyclohexadiene derivatives [M(OC_6H_3Pr_2~ⅰ-2, 6)_2Cl(η~4-C_6H_8)] (3) and [M(OC_6H_3Pr_2~ⅰ-2, 6)_3Cl(η~4-C_6H_8)] (4).