The effect of ditertiary phosphine on the cotrimerization of butadiene and styrene was studied. In the reaction of butadiene and styrene with nickel chloride-triethylaluminum-ditertiary phosphine catalyst system yielded 1-phenyl-1, 4, 8- and 1-phenyl-1, 4, 9-decatriene. 4-Vinyl-cyclohexene, 1, 5-cyclooctadiene, 1, 5, 9-cyclododecatriene and 4-phenylcyclohexene were also produced. The catalyst system, NiCl
2 : AlE
t3 : Ph
2PCH
2CH
2PPh
2=1 : 10 : 0.5, gave the best result.
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