In addition to nitrile rubber, {HEAD ~ the catalysts} of the present invention are believed to be useful in the hydrogenation of polybutadiene, polyisoprene, {TAIL ~ styrene butadiene rubber}, butadiene methacrylonitrile rubber, isoprene methacrylonitrile rubber, butadiene isoprene copolymer, butadiene isobutylene copolymer and natural rubber 
In addition to nitrile rubber , { HEAD ~ the catalysts } of the present invention are believed to be useful in the hydrogenation of polybutadiene , polyisoprene , { TAIL ~ styrene butadiene rubber } , butadiene methacrylonitrile rubber , isoprene methacrylonitrile rubber , butadiene isoprene copolymer , butadiene isobutylene copolymer and natural rubber
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