Abstract
AbstractA series of ruthenium complexes bearing different phosphines and diamines were synthesized and their components and structures were characterized by NMR spectra and elemental analyses. The catalytic properties of these complexes for the hydrogenation of benzylideneacetone and the mixture of acetophenone and styrene were investigated. The results showed that the basicity increase of phosphine or diamine dramatically facilitates the hydrogenation activity and selectivity to CO double bond. On the contrary, the basicity decrease of phosphine or diamine not only slows down the catalytic activity, but also significantly suppresses the hydrogenation selectivity to CO double bond. Based on the effect of electron factors of these complexes on the hydrogenation activity and selectivity of benzylideneacetone and the mixture of styrene and acetophenone, the activation mechanism of dihydrogen in ruthenium‐phosphine‐diamine system was proposed.
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