New bidentate cationic and zwitterionic relatives of Crabtree's hydrogenation catalyst

摘要

Inspired by the monodentate P,N ligation strategy featured in Crabtree's catalyst [(COD)Ir(PCy3)(Py)]~+PF_6~-([1]~+PF_6~-new class of bidentate cationic([20L )and zwitterionic(3)Ir complexes have been developed,which are capable of mediating the hydrogenation of alkenes under mild conditions and in a wider range of solvents than is possible for