The optimum using amount of CuI,a molar ratio of CuI to Grignard reagent is 25%. A new reaction mechanism is proposed to addition of allyl Grignard reagent with carbonyl compounds in the presence of CuI.

• CuI的最佳用量是它与格氏试剂的摩尔比为25%25，并且根据实验结果提出了相应的反应机理。