A compound of formula ##STR00001## wherein X.sup.- is an anion; n is 1, 2, 3 or 4; R.sub.1 is C.sub.1-C.sub.12alkyl, C.sub.3-C.sub.8cycloalkyl; or C.sub.2-C.sub.12alkenyl; R.sub.2 is hydrogen, unsubstituted or substituted C.sub.1-C.sub.12alkyl or C.sub.2-C.sub.12alkenyl; R.sub.3 is hydrogen, unsubstituted or substituted C.sub.1-C.sub.12alkyl, C.sub.3-C.sub.12cycloalkyl, C.sub.2-C.sub.12alkenyl; or C.sub.2-C.sub.12alkynyl; or R.sub.2 and R.sub.3 together are an alkylene or alkenylene bridge; and, where applicable, E/Z isomers, E/Z isomeric mixtures and/or tautomers; with the proviso that R.sub.1 is not sec-butyl or isopropyl when R.sub.2 is H and R.sub.3 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.