| http://www.w3.org/ns/prov#value | - r different and are a hydrogen atom or a C1 -C8 -alkyl radical, at temperatures of from 20??? to 150??? C. and at a pressure of from 0.01 to 64 bar, in the presence of a catalyst which comprises an aluminoxane of the formula IX ##STR4## for the linear type and/or of the formula X ##STR5## for the cyclic type, where, in the formulae IX and X, R13 is a C1 -C6 -alkyl group, phenyl or benzyl, and n is
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