Process for the selective hydrogenation of compounds containing endo- and exocyclic insaturations.

摘要

Process for the selective hydrogenation of polyunsaturated ring compounds containing at least one endocyclic carbon-carbon double bond and at least one terminal exocyclic carbon-carbon double bond, the said double bonds not being conjugated, to a mixture containing essentially the saturated ring compound and containing at least one terminal exocyclic double bond, the process being conducted in the presence of hydrogen, at a pressure of 1 to 10 MPa and a temperature of 0 to 200@C and in the presence of a catalyst containing a support and (a) 0.1 to 5 % by weight of at least one metal of group VIII (iridium, osmium, nickel, palladium, platinum and rhodium), and (b) 0.01 to 15 % by weight of at least one metal of group IVa (tin, germanium and lead), the molar ratio of the metals of group VIII to those of group IVa being between 0.3 and 3. The process is employed for the hydrogenation of 4-vinylcyclohexene to vinylcyclohexane.