Patent ID: 7618952

Claim:
A compound of formula (I) or an N-oxide thereof: where: X is O or S; RING is phenyl or thienyl; Het is a 5- or 6-membered heterocyclic ring containing one to three heteroatoms, each independently selected from oxygen, nitrogen and sulphur, the ring being substituted by one to four groups R 4 ; R 1 is hydrogen, optionally substituted (C 1-4 )alkyl, formyl, optionally substituted (C 1-4 )alkylC(═O), optionally substituted (C 1-4 )alkylC(═O)O, optionally substituted (C 1-4 )alkoxy(C 1-4 )alkyl, optionally substituted allyl, optionally substituted propargyl or optionally substituted allenyl; each R 2 is, independently, halogen, optionally substituted (C 1-4 )alkyl, optionally substituted (C 1-4 )alkoxy or optionally substituted (C 1-4 )alkoxy(C 1-4 )alkyl; R 3 is (CR a R b ) m —Cy—(CR c R d ) n —Y; each R 4 is, independently, selected from halogen, C 1-3 alkyl, C 1-3 haloalkyl, C 1-3 alkoxy(C 1-3 )alkyl and cyano; R a , R b , R c and R d are each, independently, hydrogen or optionally substituted (C 1-4 )alkyl; Cy is an optionally substituted carbocyclic or heterocyclic 3-7 membered ring which may be saturated, unsaturated or aromatic and which optionally contains a silicon atom as a ring member; (CR a R b ) m and (CR c R d ) n may be bound either to the same carbon or silicon atom of Cy or to different atoms separated by 1, 2 or 3 ring members; Y is Si(O p Z 1 )(O q Z 2 )(O s Z) and provided that Cy contains a silicon atom as a ring member then Y may also be hydrogen; Z is C 1-4 alkyl or C 2-4 alkenyl each of which is optionally interrupted by one heteroatom selected from O, S and N and is optionally substituted by one to three independently selected halogen atoms; Z 1 and Z 2 are, independently, methyl or ethyl; m and n are each, independently, 0, 1, 2 or 3; p, q and s are each, independently, 0 or 1; and r is 0, 1 or 2; provided that Y is not tri(C 1-4 )alkylsilyl when m and n are both 0 and RING and Cy are both phenyl.