The process 1, 2, 3 or 4 wherein in the preparation of the reaction product from the intermediate product and the nucleophilic reagent, {HEAD ~ the amount} of the nucleophilic reagent is not more than 1.0 mol per mol of {TAIL ~ the Si H group} in the intermediate reaction product and at least 0.5 mol per mol of Mg in the intermediate reaction product 
The process 1 , 2 , 3 or 4 wherein in the preparation of the reaction product from the intermediate product and the nucleophilic reagent , { HEAD ~ the amount } of the nucleophilic reagent is not more than 1.0 mol per mol of { TAIL ~ the Si H group } in the intermediate reaction product and at least 0.5 mol per mol of Mg in the intermediate reaction product
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