TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: A silver nitride water solution and dicyanamide sodium salt water solution are dissolved in deionized water, mixed at room temperature for 1 hour, centrifugated, and the solids are scrubbed by water to obtain dicyanamide silver salt. The dicyanamide silver salt is stirred at 40 degrees C, filtered, scrubbed and steamed. The methylene dichloride (5-20 ml) is added to the steamed mixture, filtered, deposited, steamed and dried at 60 degrees C for 6 hours to obtain tetrahydrothiophene onium type ion liquid with dicyanamide as anion. The bistrifluoromethylsulfamide lithium salt and iodide S-alkyl tetrahydrothiophene onium are mixed at room temperature for 3 hours, extracted by methylene dichloride, steamed and dried at 80 degrees C for 6 hours to obtain tetrahydrothiophene onium type ion liquid with bitrifluromethylsulfamide as anion. The hexafluoropotassium phosphate and iodide S-alkyl tetrahydrothiophene onium are dissolved in deionized water, stirred at room temperature for 1 hour, centrifugated, scrubbed and dried at 60 degrees C for 2 hours to obtain tetrahydrothiophene onium type ion liquid with hexafluorophosphate radical as anion. The nitrate radical and iodide S-alkyl tetrahydrothiophene onium are dissolved in de-ionized water, stirred at room temperature for 1.5 hours, filtered and steamed. To the steamed mixture, dichloroethane (5-20 ml) is added, mixed, steamed, filtered, steamed and dried at 60 degrees C for 2 hours to obtain tetrahydrothiophene onium type ion liquid with nitrate radical as anion. The tetracyano-boron is dissolved in de-ionized water and stirred. To the mixture, water solution of iodide S-alkyl tetrahydrothiophene onium (20 ml) is added, stirred at room temperature, extracted by methylene dichloride (20 ml), scrubbed by water (20 ml), dried, steamed and dried at 60 degrees C for 10 hours to obtain tetrahydrothiophene onium type ion liquid with tetracyano-boron as anion. Preferred Definitions:    R,R0=cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclopentenyl, cyclopentyl-1,3-dialkylene, cycloethenyl, phenyl or cycloheptenyl substituted by 1-6C alkyl, cycloalkyl substituted by 1-6C alkyl, halogen, cyan, thiocyan, seleniocyan or nitryl;    A-=I-, Br-, Cl-, (N(CN)2)-, (N(SO2CF3)2)-, (PF6)-, (BF4)-, (NO3)-, (C(CN3))-, (B(CN)4)-, (CF3COO)-, (ClO4)-, (BF3CF3)-, (CF3SO3)-, (CF3F2SO3)-, (CH3H2SO3)-, ((CF3SO2)2N)-, ((C2H5SO2)2N)-, ((CF3SO2)3C)-, ((C2F5SO2)3C)-, ((FSO23C)-, (CH3CH2OSO3)-, (CF3C(O)O)-, (CF3CF2C(O)O)-, (CH3CH2C(O)O)-, (CH3C(O)O)-, (P(C2H5)3F3)-, (P(CF3)3F3)-, (P(C2H4H)(CF3)2F3))-, (P(C2F3H2)3F3)-, (P(C2F5)(CF3)2F3)-, (P(CF3)3F3)-, (P(C6H5)3F3)-, (P(C3H7)3F3)-, (P(C4H9)3F3)-, (P(C2H5)2F4)-, ((C2H5)2P(O)O)-, ((C2H5)2P(O)O2)2-, (PC6H5)2F4)-, ((CF3)2P(O)O)-, ((CH3)2P(O)O)-, ((C4H9)2P(O)O)-, (CF3P(O)O2)2-, (CH3P(O)O2)2-, ((CH3O)2P(O)O)-, (BF2(C2F5)2)-, (BF3(C2F5))-, (BF2(CF3)2)-, (B(C2F5)4)-, (BF3(CN))-, (BF2(CN)2)-, (B(CF3)4)-, (B(OCH3)4)-, (B(OCH3)2(C2H5))-, (B(O2C2H4)2)-, (B(O2C2H2))-, (B(O2CH4)2)-, (N(CF32)-, (AlCl4)- or (SiF6)2-, preferably I-, Br-, N(SO2CF3)2-, (N(CN)2)-, (BF4)-, (PF6)-, CF3COO-, (B(CN)4)-, (C(CN)3)- or (BF3CF3)-, more preferably (N(CN)2)-;    Rf,Rf'=mutually nonadjacent atoms, radicals or end group -SO2X' not at a position of heteroatom such as -O-, -SO2 and/or -NR", preferably -CF3, -C2F5, -C3F7, -C4F9, -C(CF3)3-, -CF2N(CF3)CF3, -CF2OCF3, -CF2S(O)CF3, -CF2SO2CF3, -C2F4N(C2F5)C2F5, -CF=CF2, -C(CF3)=CFCF3, -CF2CF=CFCF3, -CF=CFN(CF3)CF3, -CF2SO2F, -C(CF3)=CFCF3, -CF2CF=CFCF3 or -CF=CFN(CF3)CF3;    R"=1-6C alkyl, optionally fluorinated 3-7C cycloalkyl, (un)substituted phenyl, -C6H5 or (un)substituted heterocycle;    X'=fluorine, chlorine or bromine;    Rf=pentafluorine ethyl, heptafluorine propyl or nonafluorine butyl, preferably trifluorine methyl, pentafluorine ethyl, heptafluorine propyl or nonafluorine butyl;and    R1=allyl, butene group, isobutene group, secondary butene group, pentenyl, hexane group, heptane group, -C9H17, -C10H19, C20H19, 2 or 3-butene group, ethyne group, propyne group, butine group, pentyne group, hexin group, heptyne group, -C9H15, -C10H17, C20H17, 1 or 2-propyne group, 2 or 3-butine group, 4-pentyne group or 3-pentyne group.    Rf and Rf' are connected in pairs with single bond or double bond to form double-ring or multi-ring anions.