| http://www.w3.org/ns/prov#value | - A method comprising the step of mixing in a solvent selected from the group consisting of ether and tetrahydrofuran, containing a small amount of an alkyl halide, a small amount of magnesium with a compound of the formula XCH Si(R )3 (III) wherein X is a halogen atom, and R is selected from the group consisting of halogen, (C C )-alkyl, phenyl, (C C )-alkoXy, and at least one of the R groups being
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