Heterocyclic amide derivatives useful as microbiocides

The invention relates to a fungicidally active compound of formula (I): where 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 the groups R 6 , R 7 and R 8 ; R 1 is hydrogen, C 1-4 alkyl, C 1-4 haloalkyl, C 1-4 alkoxy, C 1-4 haloalkoxy, CH 2 C≡CR 9 , CH 2 CR 10 ═CHR 11 , CH═C═CH 2 or COR 12 ; R 2 and R 3 are each, independently, hydrogen, halo, C 1-4 alkyl, C 1-4 alkoxy, C 1-4 haloalkyl or C 1-4 haloalkoxy; R 4 and R 5 are each independently selected from halo, cyano and nitro; or one of R 4 and R 5 is hydrogen and the other is selected from halo, cyano and nitro; R 6 , R 7 and R 8 are each, independently, hydrogen, halo, cyano, nitro, C 1-4 alkyl, C 1-4 haloalkyl, C 1-4 alkoxy(C 1-4 )alkyl, C 1-4 haloalkoxy(C 1-4 )alkyl or C 1-4 haloalkoxy, provided that at least one of R 6 , R 7 and R 8 is not hydrogen; R 9 , R 10 and R 11 are each, independently, hydrogen, halo, C 1-4 alkyl, C 1-4 haloalkyl or C 1-4 alkoxy(C 1-4 )alkyl; and R 12 is hydrogen, C 1-6 alkyl, C 1-6 haloalkyl, C 1-4 alkoxy(C 1-4 )alkyl, C 1-4 alkylthio(C 1-4 )-alkyl, C 1-4 alkoxy or aryl; to the preparation of these compounds, to novel intermediates used in the preparation of these compounds, to agrochemical compositions which comprise at least one of the novel compounds as active ingredient, to the preparation of the compositions mentioned and to the use of the active ingredients or compositions in agriculture or horticulture for controlling or preventing infestation of plants by phytopathogenic microorganisms, preferably fungi.