content_image/891186.jpg content_image/891188.jpg content_image/891187.jpg content_image/891190.jpg
## (Synthesis Example 30) Synthesis of 2,4-dime› thoxy-4 ’-(2-methacry loxy )ethoxybenzophenone 

<img src='content_image/891186.jpg'>

5.4 g of 2,4-dimethoxy-4’-(2-methacryloxy)ethoxybenzo› phenone is obtained in the same procedure as Synthesis Example 14 except that 2,4-dimethoxy-4’-(2-hydroxy) ethoxybenzophenone is used instead of 1-( 4-hydroxyphe› ny 1)-2,2-dimethy 1-1-propanone. 

(Synthesis Example 31) Synthesis of 2,4-dime› thoxy-4’-(2-methacryloxy)ethoxybenzhydrol (Com› pound Cl) 

<img src='content_image/891188.jpg'>

3.7 g of 2,4-dimethoxy-4’-(2-methacryloxy)ethoxybenz› hydrol (compound Cl) is obtained in the same procedure as Synthesis Example 27 except that 2,4-dimethoxy-4’-(2- methacryloxy)ethoxybenzophenone is used instead of 2,2’, 4,4’-tetramethoxybenzophenone and the residue obtained by concentration is purified by column chromatography (ethyl acetate/hexane=20/80 (volume ratio)). 

## <Synthesis of Compound C2 Constituting Sensitizer Unit C> 

## (Synthesis Example 32) Synthesis of 1-(2,4-dime› thoxy)phenyl-1-[ 4’-(2-hydroxy)ethoxyphenyl]-1,1- dimethoxymethane 

<img src='content_image/891187.jpg'>

3.3 g of 1-(2,4-dimethoxy)phenyl-1-[4’-(2-hydroxy) ethoxyphenyl]-1,1-dimethoxymethane is obtained in the same procedure as Synthesis Example 24 except that 2,4- dimethoxy-4’-(2-hydroxy)ethoxybenzophenone is used instead of 1-( 4-hydroxyphenyl)-2-phenylethanedione. 

(Synthesis Example 33) Synthesis of 1-(2,4-dime› thoxy)phenyl-1-[ 4’-(2-methacryloxy )ethoxyphenyl]- 1, l-dimethoxymethane (Compound C2) 

<img src='content_image/891190.jpg'>

3.7 g of 1-(2,4-dimethoxy)phenyl-1-[4’-(2-methacryloxy) ethoxyphenyl]-1,1-dimethoxymethane (Compound C2) is obtained in the same procedure as Synthesis Example 14 except that 2,4-dimethoxy-4’-(2-hydroxy )ethoxybenzophe› none is used instead of l-(4-hydroxyphenyl)-2,2-dimethyl› l-propanone. 

