What is described are a compound of the formula in which R1 is C1-C12alkyl, C3-C8cycloalkyl or C2-C12alkenyl; R2 is H, unsubstituted or mono- to pentasubstituted C1-C12alkyl or unsubstituted or mono- to pentasubstituted C1-C12alkenyl; R3 is C2-C12alkyl, mono- to pentasubstituted C1-C12alkyl, unsubstituted or mono- to pentasubstituted C1-C6alkoxy-C1-C6alkyl, unsubstituted or mono- to pentasubstituted C3-C12cycloalkyl, C2-C12alkenyl, C2-C12alkynyl; or R2 and R3 together are an alkylene or alkenylene bridge; with the proviso that R1 is not sec-butyl or isopropyl if R2 is H and R3 is 2-hydroxyethyl, isopropyl, n-octyl or benzyl; or, if appropriate, in E/Z isomer, an E/Z isomer mixture and/or a tautomer thereof; a process for preparing and using these compounds and their tautomers; pesticides whose active compound is selected from these compounds and their tautomers; and a process for preparing these compounds and compositions, and the use of these compounds and compositions.