Importance

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Abstract

A compound of Formula I or a salt thereof: Ar--Q--(CH.sub.2).sub.m --A--(CH.sub.2).sub.n (CE.sup.1 .dbd.CE.sup.2).sub.a CE.sup.3 .dbd.CE.sup.4 CXNR.sup.1 R.sup.2(I) where Ar is a 6-membered heteroaromatic ring containing, as the heteroatom or heteroatoms, one or two nitrogen atoms and is optionally substituted by one or more of halogen, cyano, C.sub.1-6 -alkyl (optionally substituted by halogen), or C.sub.1-6 - alkoxy (optionally substituted by one or more of halogen or C.sub.1-6 -alkyl), or RS(O).sub.x where x is 0, 1 or 2 and R is C.sub.1-6 -alkyl optionally substituted by one or more halogen atoms, Q is --CH.sub.2 -- or --O--, m and n are each independently 0 to 7, A is --CH.sub.2 -- or --O--, a is 0 or 1, E.sup.1 to E.sup.4 are independently hydrogen, C.sub.1-4 -alkyl or halo-C.sub.1-4 -alkyl or halogen, X is oxygen or sulphur, and R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1-6 alkyl or C.sub.3-6 -cycloalkyl, either being optionally substituted by one or more of C.sub.1-6 -alkyl, C.sub.2-6 -alkenyl, dioxalanyl, C.sub.3-6 -cycloalkyl, C.sub.1-6 -alkoxy or RS(O).sub.x as defined above. The compounds and their salts are useful as insecticides and acaricides.

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