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method for cyclodimerisation of 1, 3 - diolefinen in the presence of a catalyst consisting of kohlenoxydfreien compounds of nickel and metallalkylen and triphenylphosphine
method for cyclodimerisation of 1, 3 - diolefinen in the presence of a catalyst consisting of kohlenoxydfreien compounds of nickel and metallalkylen and triphenylphosphine