wherein R1 and R2 are independently selected from hydrogen and a substituent； R3 is C1-C8haloalkyl； R4 is optionally substituted aryl/heteroaryl； n is 0, 1 or 2； , A1 is a substituted carbon atom； A2, A3 and A4 are independently selected from a nitrogen atom and an optionally substituted carbon atom； Y1--Y2- Y3 is -C=N-O-, -C=N-S-, C=N-CH2-, -C=CH-O-, -N-CH2-CH2- or -C=CH-S- . Preferably, Y1--Y2- Y3 is -C=N-O or -C=CH-S-； A2, A3 and A4 are optionally substituted carbon atoms； n is 0 or 2； R3 is CF3； R4 is 3,5-dichlorophenyl. The invention also relates to mixtures of enantiomers, processes and intermediates for preparing these compounds, to insecticidal, acaricidal, nematicidal and molluscicidal compositions comprising these compounds and to methods of using these compounds to control insect, acarine, nematode and mollusc pests. The compound of formula (I) may be combined with another pesticide.
