N-acylimino heterocyclic compounds The present invention relates to N-acylimino compound of formula (I): wherein X is 0 or S, in particular 0 Y is 0, S or NR 5 D is a bivalent radical such as optionally substituted C 1-C 6- alkandiyl, Het is a 5- or 6-membered carbon-bound or nitrogen-bound heterocyclic ring, W 1-W 2-W 3-W Represents a carbon chain group connected to N and C=N, and thus forming a saturated, unsaturated, or partially unsaturated 5 or 6 membered nitrogen containing heterocycle, wherein W 1,, W 2, W 3and W 4each individually represent CR vRW R, R 2may be hydrogen, halogen, C 1-C 6-alkyl etc. R 3hydrogen, C 1-C 6-alkyl, C 2-C 6-alkenyl, C 2-C 6-alkynyl, C 3-C 8- cycloalkyl, C 3-C 8-cycloalkyl-Ci-C 4-alkyl, etc. R 4hydrogen, C 1-C 6-alkyl, C 2-C 6-alkenyl, C 2-C 6-alkynyl, C 3-C 8- cycloalkyl, C 3-C 8-cycloalkyl-Ci-C 4-alkyl, etc. R 3and R 4together may also form a bivalent radical, selected from the group consisting of C 3-C 6-alkandiyl, C 3-C e-alkendiyl, Q-C 2-C 5-alkandiyl, Q-C 2-C 5-alkendiyl, Q "C 2-C 4-alkandiyl-Q 2and Q i-C 2- C 4-alkendiyl-Q 2, where Q 1, Q 2are 0, S or NR 7d R 5hydrogen, CN, C 1-C 6-alkyl, C 2-C 6-alkenyl, C 2-C 6-alkynyl, C 3- C 8-cycloalkyl, C 3-C 8-cycloalkyl-Ci-C 4-alkyl, C 1-C 6-alkylcarbonyl, C 1-C 6-alkylsulfonyl, etc. The invention also relates to the use of the N-acylimino heterocyclic compounds, their stereoisomers, their tautomers and their salts, for combating invertebrate pests. Furthermore the invention relates also to methods of combating invertebrate pests, which comprises applying such compounds.La présente invention concerne un composé N-acylimino de formule (I), dans laquelle X est O ou S, en particulier O Y est O, S ou NR5 D est un radical bivalent tel quun groupe alcanediyle en C1-C6, Het est un noyau hétérocyclique à 5 ou 6 chaînons, lié au carbone ou à lazote, W1-W2-W3-W4 représente un groupe à chaîne carbonée relié à N et à C=N, formant ainsi un hétérocycle azoté à 5 ou 6 chaînons, saturé, insaturé ou p
