| http://www.w3.org/ns/prov#value | - rbyl, p is an integer of 1 to 4, and q is 0 or an integer of 1 to 3, with the proviso that the sum of p and q are 4 and, optionally, a second titanium-containing compound of the formula Ti(OR2)n X2 m, where R2 is hydrocarbyl, X2 is halogen, n is an integer of 1 to 4, and m is 0 or an integer of 1 to 3 with the proviso that the sum of n and m is 4; and with the further proviso that if two titanium-
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