Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: Mgbe ị na-ekpo ọkụ amine mbụ na N-2,4-dinitrophenyl-pyridinium nnu (2), mgbakwunye nke amine na-eduga na mmeghe nke mgbanaka pyridinium. Mgbakwunye nke abụọ nke amine na-eduga na mwepụ nke 2,4-dinitroaniline (5) na nhazi nke König salt (6a na 6b). The trans-cis-trans isomer nke König nnu (6a) nwere ike ime site ma sigmatropic rearrangement ma ọ bụ nucleophilic mgbakwunye nke a zwitterionic etiti inye cyclized etiti (7). A tụrụ aro ka nke a bụrụ nzọụkwụ na-ekpebi ọnụego. Mgbe e wepụsịrị proton na amine, a na-emepụta ion pyridinium (9) a chọrọ.  Ajụjụ: Gịnị na-eme ma i tinye amine bụ́ isi?
mmeghe nke mgbanaka pyridinium