Patent ID: 6878660

Claim:
A heterogeneous catalyst immobilized on an inorganic support, comprising at least one active rhenium containing at least one carbene group, wherein the rhenium is bonded to the material used as support by a covalent bond, and which conforms to the general formula (II) Support —Re(CR 1 ) a (═CR 2 R 3 ) b (CR 4 R 5 R 6 ) c (X) d (II) in which R 1 to R 6 , independently of one another, are selected from the group consisting of hydrogen, cyclic and acyclic, linear and branched, substituted and unsubstituted C 1 -C 40 -alkyl groups, C 2 -C 40 -alkenyl and alkynyl groups, C 5 -C 9 -aromatic groups and silyl groups, X is selected from the group consisting of hydrogen, halogens, oxo groups, imido groups, alkoxy groups and nitride groups, and the indices a, c and d, independently of one another, are integers from 0 to 4, b is an integer of 1 to 4, where the values of the individual numbers depend on the stoichiometrically necessary amounts.