| http://www.w3.org/ns/prov#value | - rom the group consisting of tetraalkyl orthotitanates (tetraalkoxytitaniums), vanadyl trialcoholates and polytitanic acid esters expressed by by the general formula RO--Ti(OR)2)]m R wherein m is an integer of 2 or more and the Rs are the same or different kinds of alkyl groups, aryl groups or aralkyl groups,the ratio of the number of transition metal atoms of (c)(1) to the number of transition met
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