To obtain a nucleophilic reactant, in which a hydrocarbon group is added to a carbonyl carbon or an imino carbon, in high selectivity even under a mild condition.

Benzophenone (3.35mmol) is stirred in THF in the presence of zinc chloride (0.335mmol) and EtMgCl (4.35mmol) at 0°C for 2 hours. Then a saturated aqueous solution of ammonium chloride is added to the solution and stirred for 3 minutes at a room temperature. Subsequently, ethyl acetate is added to the solution and an ordinary liquid separation is carried out. An extracted organic layer is washed, dried with magnesium sulfate, filtered and concentrated. A product is collected by a neutral silica gel column (hexane; ethyl acetate=5:1) to give a corresponding tertiary alcohol in a yield of 84%.

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