Pnictogen-containing heterocyclic compounds and their use

A pnictogen-containing heterocyclic compound of Formula (I):

• in which
• R1 is C1-C6 alkyl, C4-C10 cycloalkyl, 5- to 8-membered heterocycloalkyl, aryl, or heteroaryl;
• is a heterocyclic ring;
• A+ is a cationic quaternary pnictogen atom;
• LG is a leaving group selected from the group consisting of halogen, aryloxy, RaO2S—, RbO2S—O—, RcOS—, RdS(O)(NSO2Re)—, and RfS(O)(N+(CH3)2)-, each of Ra, Rb, Rc, Rd, Re, and Rf, independently, being C1-C6 alkyl, aryl, heteroaryl, halogen, alkoxy, or aryloxy;
• X− is a counter anion selected from the group consisting of halide, polyhalide anion, perchlorate, hydroxide, peroxide, siloxide, sulfate, hydrogen sulfate, sulfite, disulfite, dithionate, dithionite, halosulfate, thiosulfate, persulfate, disulfate, sulfinate (R′SO2−), sulfonate (R″SO3−), bis(sulfonyl)imide ((R′SO2)2N−), nitrate, nitrite, azide, cyanide, cyanate, thiocyanate, phosphate, metaphosphate, polyphosphate, hydrogen phosphate, dihydrogen phosphate, monohalophosphate, dihalophosphate, hexahalophosphate, organophosphonate (R′P(O)(O−)2 or R′P(O)(OR−) (O−)), organophosphate (R′OP(O)(O)2 or R′OP(O)(OR″)(O−)), arsenate, alkoxide, alkenoxide, aryloxide, carboxylate, percarboxylate, carbonate, bicarbonate, oxalate, borate, tetrahaloborate, tetraalkylborate, tetraarylborate, carborane, and combinations thereof, each of R′ and R″, independently, being C1-C6 alkyl or aryl;
• and
• the number of net negative charges of X″ equals to that of the net positive charges of