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1.The free-phosphine carbene ruthenium complex [1,3-bis(2,6-dimethylphenyl)-2-tetrahydroimidazol[(C5H5N)2(Cl)2Ru=CHPh (8) was prepared by the reaction of [1,3-bis(2,6-dimethylphenyl)-2-tetrahydroimidazol](PPh3)(Cl)2Ru=CHPh (7) with pyridine and used as a highly effective catalyst for the cross metathesis of acrylonitrile with allylbenzene.
