| http://www.w3.org/ns/prov#value | - m compound represented by the following formula: Ti(OR)gX4???g [0255] wherein R is a hydrocarbon group, X is a halogen atom, and g is a number satisfying the condition of 0???g???4. [0256] Concrete examples of the titanium compounds include: [0257] titanium tetrahalide such as TiCl4, TiBr4 and TiI4; [0258] alkoxytitanium trihalide such as Ti(OCH3)Cl3, Ti(OC2H5)Cl3, Ti(On???C4H9)Cl3, Ti(OC2H5)Br3 a
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