Abstract
Iridium pincer complex (POCOP)IrH2 (1; POCOP = κ3-C6H3-1,3-[OP(tBu)2]2) catalyzes hydrogenolysis of 1,2-propanediol to n-propanol in good yield under mild conditions (acidic aqueous dioxane, 50–125 °C, 100–600 psi H2). Studies of catalyst speciation revealed that the catalyst reservoir species is (POCOP)Ir(CO) (2), formed by decarbonylation of the substrate. Complex 2 is a superior catalyst precursor, since it is air-stable and readily prepared by treating complex 1 with CO.
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