Nov. 17,  2016  40  US 2016/0334706 Al  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.  [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.  TABLE 1  Synthesis Examples 2-2 to 2-15  Synthesis of Polymers P-2 to P-15  Synthesis of Polymer P-1  Synthesis Example 2-1  Unit 1  Unit 2  Unit 3  Unit4  Unit 5  Resin  (molar ratio)  (molar ratio) (molar ratio) (molar ratio) (molar ratio)  P-1  PAG Monomer-! (0.20)  A-1 (0.30)  B-1 (0.20)  B-5 (0.30)  P-2  PAG Monomer-2 (0.20)  A-1 (0.30)  B-1 (0.20)  B-5 (0.30)  P-3  PAG Monomer-3 (0.20)  A-1 (0.30)  B-1 (0.20)  B-5 (0.30)  P-4  PAG Monomer-4 (0.20)  A-1 (0.30)  B-1 (0.20)  B-5 (0.30)  P-5  PAG Monomer-5 (0.20)  A-1 (0.30)  B-1 (0.20)  B-5 (0.30)  P-6  PAG Monomer-6 (0.20)  A-1 (0.30)  B-1 (0.20)  B-5 (0.30)  P-7  PAG Monomer-2 (0.20)  A-2 (0.30)  B-1 (0.20)  B-3 (0.30)  P-8  PAG Monomer-2 (0.20)  A-1 (0.20)  A-4 (0.20)  B-1 (0.20)  B-5 (0.20)  P-9  PAG Monomer-2 (0.20)  A-1 (0.20)  A-5 (0.20)  B-1 (0.20)  B-5 (0.20)  P-10  PAG Monomer-2 (0.20)  A-1 (0.20)  A-6 (0.20)  B-1 (0.20)  B-5 (0.20)  P-11  PAG Monomer-2 (0.20)  A-1 (0.20)  A-4 (0.20)  B-5 (0.20)  B-6 (0.20)  P-12  A-3 (0.40)  B-2 (0.10)  B-5 (0.50)  P-13  A-2 (0.40)  B-2 (0.10)  B-3 (0.50)  P-14  A-1 (0.40)  B-2 (0.10)  B-4 (0.50)  P-15  A-1 (0.20)  A-2 (0.30)  B-2 (0.10)  B-5 (0.40)  (P-1)  cU)a  /  ’j==o  0  Q  usu  ,,e’y,  SO3- cUlb  /  ’j==o  0  cU)c  /  ’j==o  cUJd  /  ’j==o  0  0  Q  OH  0  a~ 0.20, b  ~  0.30, c  ~  -.30, d  ~  0.20 