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Under a nitrogen atmosphere, a solution of 10.2 g of p-bromoisobutylbenzene in 30 ml of benzene was added dropwise slowly to 1.2 g of magnesium turnings in 20 ml of THF at the refluxing temperature. To the resulting p-isobutylphenyl magnesium bromide solution was added 3.14 g of anhydrous zinc chloride in an atmosphere of nitrogen. When the temperature of the resulting mixture was maintained at 25° to 30° C. for 1 hour, a solution of di-(p-isobutylphenyl) zinc formed.

1. temperatureWhen the temperature of the resulting mixture was maintained at 25° to 30° C. for 1 hour