Catalytic ionic hydrogenation of ketones using tungsten or molybdenum catalysts with increased lifetimes

摘要

The present invention is a process for the catalytic hydrogenation of ketones and aldehydes to alcohols at low temperatures and pressures using organometallic molybdenum and tungsten complexes and the catalyst used in the process. The reactants include a functional group which is selected from groups represented by the formulas R*(C═O)R′ and R*(C═O)H, wherein R* and R′ are selected from hydrogen or any alkyl or aryl group. The process includes reacting the organic compound in the presence of hydrogen and a catalyst to form a reaction mixture. The catalyst is prepared by reacting Ph₃C^+A^− with a metal hydride. A^− represents an anion and can be BF₄^−, PF₆^−, CF₃SO₃^− or Bar′₄^−, wherein Ar′=3,5-bis(trifluoromethyl)phenyl. The metal hydride is represented by the formula: HM(CO)₂[&eegr;⁵:&eegr;¹—C₅H₄(XH₂)_nPR₂] wherein M represents a molybdenum (Mo) atom or a tungsten (W) atom; X is a carbon atom, a silicon atom or a combination of carbon (C) and silicon (Si) atoms; n is any positive integer; R represents two hydrocarbon groups selected from H, an aryl group and an alkyl group, wherein both R groups can be the same or different. The metal hydride is reacted with Ph₃C^+A^− either before reacting with the organic compound or in the reaction mixture.