Lee ihe dị n'okpuru ebe a ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka akụkụ ahụ: Nkeji edemede: 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 mbugharị nke 2,4-dinitroaniline (5) na nhazi nke König salt (6a na 6b). The trans-cis-trans isomer nke König salt (6a) nwere ike imeghachi omume site na ma ọ bụ mgbanwe sigmatropic ma ọ bụ nucleophilic mgbakwunye nke zwitterionic intermediate iji nye cyclized intermediate (7). A na-atụ aro ka ọ bụrụ nzọụkwụ na-ekpebi ọnụego. Mgbe nnyefe proton na mkpochapụ amine, ion pyridinium achọrọ bụ (9) Ajụjụ: Gịnị na-eme mgbe ị gbakwunye amine mbụ?
mmeghe nke mgbanaka pyridinium