| http://www.w3.org/ns/prov#value | - Alternatively, the compound of formula (2) can be prepared by reacting a compound of the general formula (7): (R1O)(3-p)(R2)pSi???R3???X???(7) wherein R1, R2, R3 and p are as defined above, and X is a halogen atom, with an anhydrous alkali metal sulfide or anhydrous alkali metal polysulfide of the general formula (3): M2Sr???(3) and optionally a halogen-containing compound of the general formula (
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