| http://www.w3.org/ns/prov#value | - Preferably, the alkoxide has the formula M(OR)x in which M is titanium, zirconium, hafnium, aluminium, or a lanthanide, R is an alkyl group and x is the valency of the metal M. More preferably R contains 1 to 6 carbon atoms and particularly suitable alkoxides include tetraisopropoxy titanium, tetra-n-butoxy titanium, tetra-n-propoxy zirconium, tetra-n-butoxy zirconium and aluminium tri-sec-butoxid
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