A compound of formula wherein X− 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.