. . "1434-193X" . . "170804" . . . . "We report efficient methods for the synthesis of both symmetrically and non-symmetrically substituted bis(imidazol-2-yliden)ammonium ions and a new family of bis(imidazol-2-ylidene)formamidines. The fragmentation pathways of these cations were studied in detail by electrospray ionization combined with tandem mass spectrometry. Interestingly, in these cations direct CN bond cleavage leading to loss of alkyl radicals can compete with rearrangement reactions leading to closed-shell fragments. The experimental results for the major fragmentation channels are compared with those derived from DFT calculations. Inter alia, a novel rearrangement of the cationic species involving specific alkyl migrations between the two imidazole subunits has been found."@en . "Schr\u00F6der, Detlef" . . "11"^^ . "000305942800016" . "We report efficient methods for the synthesis of both symmetrically and non-symmetrically substituted bis(imidazol-2-yliden)ammonium ions and a new family of bis(imidazol-2-ylidene)formamidines. The fragmentation pathways of these cations were studied in detail by electrospray ionization combined with tandem mass spectrometry. Interestingly, in these cations direct CN bond cleavage leading to loss of alkyl radicals can compete with rearrangement reactions leading to closed-shell fragments. The experimental results for the major fragmentation channels are compared with those derived from DFT calculations. Inter alia, a novel rearrangement of the cationic species involving specific alkyl migrations between the two imidazole subunits has been found." . "Kunetskiy, Roman Alexejevi\u010D" . "Stabilities of Immonium Ions Derived from N-Heterocyclic Carbenes Probed by Collision-Induced Dissociation Mass Spectrometry"@en . "Polyakova, Svetlana" . . "I" . "Stabilities of Immonium Ions Derived from N-Heterocyclic Carbenes Probed by Collision-Induced Dissociation Mass Spectrometry" . "RIV/61388963:_____/12:00379222!RIV13-AV0-61388963" . . "Stabilities of Immonium Ions Derived from N-Heterocyclic Carbenes Probed by Collision-Induced Dissociation Mass Spectrometry" . . . "Kunetskiy, Roman Alexejevi\u010D" . . "[938FB0B5DFA1]" . "20" . . "Stabilities of Immonium Ions Derived from N-Heterocyclic Carbenes Probed by Collision-Induced Dissociation Mass Spectrometry"@en . "3"^^ . . "10.1002/ejoc.201200386" . . "Schr\u00F6der, Detlef" . "Polyakova, Svetlana" . . "3"^^ . . . "European Journal of Organic Chemistry" . . "DE - Spolkov\u00E1 republika N\u011Bmecko" . "carbenes; cations; collision-induced dissociation; density functional calculations; electrospray ionization; lipophilic cations; mass spectrometry; phase-transfer catalysis"@en . "RIV/61388963:_____/12:00379222" .