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