The present invention provides compounds of formula (I): wherein A1, A2, A3 and A4 are independently of one another C-H, C-R5, or nitrogen B1--B2--B3--B4 is -CH2-C=N-CH2-, -CH2-N-CH2-CH2-, -CH2-C=CH-0- or -CH=C-CH2-0- G1 is oxygen or sulfur L is a single bond or C1-C8alkylene R1 is hydrogen, C1-C8alkyl, C1-C8alkylcarbonyl-, C1-C8alkoxy, C2-C8alkenyl, C2-C8alkynyl, C1-C8alkoxy- C1-C8alkyl, aryl or aryl substituted by one to three R6, or R1 is heterocyclyl or heterocyclyl substituted by one to three R6 or C1-C8alkoxycarbonyl- R2 is hydrogen, C1-C8haloalkyl or C1-C8alkyl R3 is C1-C8haloalkyl R4 is aryl or aryl substituted by one to three R6, or R4 is heterocyclyl or heterocyclyl substituted by one to three R6 Y1 is CR7R8, C=O or C=S Y2, Y3 and Y4 are independently CR7R8, C=0, C=S, N-R9, O, S, SO or SO2 wherein at least two adjacent ring atoms in the ring formed by Y1, Y2, Y3 and Y4 are heteroatoms each R7 and R8 is independently hydrogen, halogen, C1-C8alkyl, or C1-C8haloalkyl and R5, R6, R7, R8 and R9 are as defined in the claims. The invention also relates to 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.Cette invention concerne des composés de formule (I), des procédés et des intermédiaires pour les préparer, des compositions insecticides, acaricides, nématicides et molluscicides les contenant et des procédés dutilisation de ces composés pour lutter contre les ravageurs de type insectes, acariens, nématodes et mollusques. Dans la formule (I), A1, A2, A3 et A4 sont indépendamment lun de lautre C-H, C-R5, ou un atome dazote B1--B2--B3--B4 est -CH2-C=N-CH2-, -CH2-N-CH2-CH2-, -CH2-C=CH-O- ou -CH=C-CH2-O- G1 est un atome doxygène ou de soufre L est une liaison simple ou un alkylène C1-C8 R1 est un atome dhydrogène, un alkyle C1-C8, un alkyl(C1-C8)carbonyle-, un al
