2-phenyl-4-pyrone derivatives, their preparation and their use as

Abstract

The invention relates to new 2-phenyl-4-pyrone derivatives which can be used in agriculture. They correspond to the general formula: ##STR1## in which X.sub.1 and X.sub.2, which are identical or different, each represent a hydrogen or halogen atom, with the proviso that at least one of these substituents represents a halogen atom, R.sub.1 represents an alkoxy radical (C.sub.1 -C.sub.4), an alkenyloxy radical containing from 2 to 4 carbon atoms, a propargyloxy radical, a halogenoalkoxy radical (C.sub.1 -C.sub.4), an amino radical, an alkylamino radical (C.sub.1 -C.sub.4) or a dialkylamino radical in which each of the alkyl parts, which are identical or different, contains from 1 to 4 carbon atoms, R.sub.2 represents a halogen atom, an alkyl radical containing from 1 to 5 carbon atoms, an alkoxy radical (C.sub.1 -C.sub.4), an alkenyloxy radical (C.sub.3 -C.sub.4), an alkynyloxy radical (C.sub.3 -C.sub.4), an alkylthio radical (C.sub.1 -C.sub.4), a halogenoalkyl radical (C.sub.1 -C.sub.4), a halogenoalkoxy radical (C.sub.1 -C.sub.4), a halogenoalkylthio radical (C.sub.1 -C.sub.4) or the nitro, hydroxyl or cyano radical and n is an integer which can be equal to 0, 1, 2, 3, 4 or 5, it being understood that, if n is greater than or equal to 2, the substituents R.sub.2 can be identical or different. They can be used for protecting plants against fungal diseases.