| http://www.w3.org/ns/prov#value | - oms, X is a halogen atom and n is a number satisfying 0<n???4) with an organo magnesium compound in the presence of an organo silicon compound having Si--O bonds represented by the following general formula: Si(OR3)m R4 4-m, R5 (R2 6 SiO)p SiR7 3 or (R8 2 SiO)q (wherein R3 is a hydrocarbon group having 1 to 20 carbon atoms; R4, R5, R6, R7 and R8 are each a hydrocarbon group having 1 to 20 carbon a
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