| http://www.w3.org/ns/prov#value | - r a silane ether of the formula RSi(OR')m R.sub.(3-m)IV (IV) where R, R' and RIV are the same or different alkyl or aryl groups and m is 1, 2 or 3; (d) pre-activating the product of step (c) with a mixture of a halogenating agent and an aluminum compound of the formula Rn 'AlX.sub.(3-n) (V) where R' is a C1 -C10 alkyl group, X is a ha
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