| http://www.w3.org/ns/prov#value | - Suitable titanium compounds which can be employed in the preparation of the compounds of the present invention containing both chromium and titanium include those represented by the formula (RO)n TiX4-n where R is a monovalent hydrocarbyl group, X is a halogen such as chlorine, bromine, iodine, preferably chlorine or bromine, and n has a value of from 1 to 3, preferably 2.
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