A compound of formula wherein X&minus； is an anion； n is 1, 2, 3 or 4； R1 is C1-C12alkyl, C3-C8cycloalkyl； or C2-C12alkenyl； R2 is hydrogen, unsubstituted or substituted C1-C12alkyl or C2-C12alkenyl； R3 is hydrogen, unsubstituted or substituted C1-C12alkyl, C3-C12cycloalkyl, C2-C12alkenyl； or C2-C12alkynyl； or R2 and R3 together are an alkylene or alkenylene bridge； and, where applicable, E/Z isomers, E/Z isomeric mixtures and/or tautomers； with the proviso that R1 is not sec-butyl or isopropyl when R2 is H and R3 is methyl； and, where applicable, their possible tautomers； a process for the preparation of those compounds and their tautomers and the use thereof； pesticidal compositions in which the active ingredient has been selected from those compounds and their tautomers； and a process for the preparation of those compositions and the use thereof； intermediates, in free form or in salt form, for the preparation of those compounds and, where applicable, their tautomers, in free form or in salt form, are described.
