content_image/904000.jpg content_image/904001.jpg
trated under reduced pressure. The concentrate was washed with diisopropyl ether, obtaining 16.8 g of the target com› pound, tetrabutylammonium 2-(24-nor-5-cholane-3,7,12- trion-23-y lcarbony loxy )-1, 1,3 ,3 ,3-pentafluoropropane-1- sulfonate (Additive-4), as oily matter (yield 98%). 

[0154] The target compound was analyzed by spectros› copy. The data of IR and TOFMS are shown below. The NMR spectra, $^{1}$H- and $^{19}$F-NMR in DMSO-d$_{6 }$ are shown in FIGS. 7 and 8. On lH-NMR analysis, trace amounts of residual solvents (diisopropyl ether and methyl isobutyl ketone) and water in DMSO-d$_{6 }$ were observed. 

[0155] IR (D-ATR): 2963, 2876, 1769, 1711, 1467, 1381, 1250, 1215, 1183, 1168, 1119, 1070, 992, 735, 642 cm- 1 

[0156] TOFMS (MALDI) 

[0157] Positive M+ 242 (corresponding to C$_{16}$H$_{36}$N+) 

[0158] Negative M- 613 (corresponding to CF$_{3}$CH (OCO----C$_{23}$H$_{33}$O$_{3}$ )CF 2 SO$_{3 }$-) 

[0159] In a flask under nitrogen atmosphere, 32.9 g of tripheny lsulfonium 2-methacryloy loxy-1, 1,3 ,3 ,3-pentafluo› ropropane-1-sulfonate, 24.1 g of 3-ethyl-3-exo-tetracyclo› [ 4.4.0.12•5 .l 7•10]dodecanyl methacrylate, 10.4 g of 4-hy› droxyphenyl methacrylate, 19.7 g of 4,8-dioxatricyclo-[4.2. 1.0 3 • 7 ]nonan-5-on-2-yl methacrylate, 3.4 g of dimethyl 2,2’› azobis(isobutyrate), 0.69 g of2-mercaptoethanol, and 175 g of methyl ethyl ketone (MEK) were mixed to form a monomer solution. Another flask under nitrogen atmosphere was charged with 58 g ofMEK, which was heated at 80° C. with stirring. With stirring, the monomer solution was added dropwise to the other flask over 4 hours. After the comple› tion of dropwise addition, the polymerization solution was continuously stirred for 2 hours while maintaining the temperature of 80° C. The polymerization solution was cooled to room temperature, whereupon it was added drop› wise to a mixture of 100 g MEK and 900 g hexane. The precipitate was collected by filtration, washed twice with 600 g of hexane, and vacuum dried at 50° C. for 20 hours, obtaining a polymer (P-1) in white powder solid form. Amount 77 .5 g, yield 89%. The polymer (P-1) has the structure shown below. 

## Synthesis Example 2-1 

## Synthesis of Polymer P-1 

<img src='content_image/904000.jpg'>

<img src='content_image/904001.jpg'>

[0160] Polymers (or resins) were synthesized by the same procedure as in Synthesis Example 2-1 aside from changing the type and amount of monomers. Table 1 shows the proportion (in molar ratio) of units incorporated in these polymers, and Tables 2 to 4 show the structure of recurring units. 

## Synthesis Examples 2-2 to 2-15 

## Synthesis of Polymers P-2 to P-15 

