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25.0 g of the anisole solution of the pheylglyoxyloyl chloride obtained in Synthesis Example 21 is dissolved in 35 g of methylene chloride and set to 0° C. 4.3 g of aluminum chloride is added thereto and the mixture is stirred at 0° C. for 2 hours. 35 g of pure water is added thereto, and the mixture is stirred for 10 minutes and then phase separation is performed. The obtained organic layer is washed twice with 30 g of pure water, and the combined organic layer is concentrated and purified by colunm chromatography ( ethyl acetate/hexane=l0/90 (volume ratio)) to obtain 5.6 g of 1-( 4-methoxyphenyl )-2-phenylethanedione. 

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5.0 g of 4-methoxybenzil is dissolved in 95 ml of acetic acid. 33.2 g of 48% by mass of aqueous HBr solution is added dropwise thereto at 70° C. over 10 minutes. After the dropwise addition, the mixture is stirred at 110° C. for 70 hours. Thereafter, 150 g of water is added to crystallize. This 40 is filtered, the crystal is washed with 250 g of water and then dried to obtain 4.1 g of 1-( 4-hydroxyphenyl)-2-phenyle› thanedione. 

## (Synthesis Example 24) Synthesis of 2,2-dime› thoxy-l-( 4-methacryloxyphenyl)ethan-1-one (Com- pound B6) 

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## (Synthesis Example 23) Synthesis of 1-( 4-hydroxypheny 1)-2-pheny lethanedione 

4.0 g of 1-( 4-hydroxyphenyl)-2-phenylethanedione and 0.10 g of sulfuric acid are dissolved in 12 g of methanol and set to 25° C. 2.2 g of trimethyl orthoformate is added dropwise thereto and the mixture is stirred for 3 hours. After adding 0.6 g of triethylamine at 30° C. and stirring for 5 minutes, the solvent is evaporated. 25 g of acetonitrile, 4.5 g oftriethylamine and 0.11 g of dimethylaminopyridine are added to the obtained residue, and 6.8 g of methacrylic anhydride diluted with 5.0 g of acetonitrile is added drop› wise at room temperature. After the dropwise addition, the mixture is stirred at 25° C. for 2 hours, then 64 g of 3% by mass of aqueous NaHCO$_{3 }$ solution is added and stirred for 5 minutes. Thereafter, the mixture is extracted with 32 g of ethyl acetate. After washing three times with 10 g of water, the combined organic layer is concentrated and purified by colurmi chromatography (ethyl acetate/hexane=l0/90 (vol› ume ratio)) to obtain 4.3 g of 2,2-dimethoxy-l-( 4-methacry› loxyphenyl)ethan-1-one ( compound B6). 

## <Synthesis of Compound B7 Constituting Unit B> 

## (Synthesis Example 25) Synthesis of 9-fluorenone O-methacryloxime (Compound B7) 

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4.5 g of 9-fluorenone O-methacryloxime ( compound B7) is obtained in the same procedure as in Synthesis Example 14 except that 9-fluorenone oxime is used instead of l-(4- hydroxyphenyl)-2,2-dimethyl-1-propanone. 

-continued 

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