content_image/884831.jpg content_image/884828.jpg content_image/884829.jpg content_image/884830.jpg content_image/884834.jpg content_image/884836.jpg content_image/884832.jpg content_image/884833.jpg content_image/884835.jpg
wherein R $^{1 }$is hydrogen, methyl or trifluoromethyl, R $^{2 }$and R 3 are each independently hydrogen or a straight, branched or cyclic, monovalent hydrocarbon group of 1 to 10 carbon atoms, R 2 and R 3 may bond together to form an alicyclic group of 5 to 10 carbon atoms, which may be separated by an 35 oxygen atom or have a carbon chain, with the carbon atom to which they are attached, X$^{1 }$is a straight, branched or cyclic, divalent hydrocarbon group of 1 to 20 carbon atoms in which a constituent ----CH$_{2}$ - may be replaced by ---0- or -C(=O)-, k$^{1 }$is 0or 1, Zforms a5 or6-memberedalicyclic 40 group, which may contain a heteroatom, with the two carbon atoms to which it is attached, X $^{4 }$is hydrogen or halogen, and R $^{4 }$is a straight, branched or cyclic, monovalent hydrocarbon group of 1 to 10 carbon atoms. 

13. The method of claim 12 wherein the acyloxyketone having the general formula (5) is obtained by reacting a cycloalkanone compound having the general formula (3) with an esterifying agent having the general formula ( 4): 

wherein R 1 , X 1 , Z and k $^{1 }$are as defined above, X$^{2 }$is halogen or hydroxyl, X$^{3 }$is---OM 6 , halogen, hydroxyl or-OR 1 4 , M 6 is Li, Na, K, Mg$_{112}$, Ca 112 or substituted or unsubstituted ammonium, and R $^{14 }$is methyl, ethyl or a group of the formula (9): 

<img src='content_image/884831.jpg'>

-continued 

<img src='content_image/884828.jpg'>

<img src='content_image/884829.jpg'>

<img src='content_image/884830.jpg'>

wherein R1, X$^{1 }$and k$^{1 }$are as defined above, and the broken line denotes a valence bond. 

14. A method for preparing a monomer having the general formula (1), comprising the steps of reacting a compound having the general formula ( 6) with a base or metal to form a metal enolate reagent, reacting it with an acyloxyketone hav› ing the general formula (5), isolating a hydroxy ester com› pound having the general formula (7b ), and treating it with an acid: 

wherein R $^{1 }$is hydrogen, methyl or trifluoromethyl, R $^{2 }$and R 3 are each independently hydrogen or a straight, branched or cyclic, monovalent hydrocarbon group of 1 to 10 carbon atoms, R 2 and R 3 may bond together to form an alicyclic group of 5 to 10 carbon atoms, which may be separated by an 

<img src='content_image/884834.jpg'>

<img src='content_image/884836.jpg'>

<img src='content_image/884832.jpg'>

<img src='content_image/884833.jpg'>

<img src='content_image/884835.jpg'>

