| 主权项 |
1. A process for degrading a nitrile rubber comprising subjecting the nitrile rubber to a metathesis reaction in the presence of the general formula (I), where M is ruthenium or osmium, Y is oxygen (O), sulphur (S), an N—R1 radical or a P—R1 radical, X1 and X2 are identical or different ligands, R1 is an alkyl, cycloalkyl, alkenyl, alkynyl, aryl, alkoxy, alkenyloxy, alkynyloxy, aryloxy, alkoxycarbonyl, alkylamino, alkylthio, arylthio, alkylsulphonyl or alkylsulphinyl radical, each of which may optionally be substituted by one or more alkyl, halogen, alkoxy, aryl or heteroaryl radicals, R2, R3, R4, R5 are identical or different and are each hydrogen, organic or inorganic radicals, R6 is hydrogen or an alkyl, alkenyl, alkynyl or aryl radical and L is a ligand. |
