R11 is alkyl group having 1 to 4 carbon atoms such as methyl group, ethyl group, propyl group or butyl group, or tri-alkyl silyl group, and numeral r is 1-4. [0197] As preferable specific examples of the oxetane compounds used in the present invention, there are compounds 4-6 shown below. [0198] The production method of the compounds having the oxetane ring is not particularly limited, and it may