Philagro

Rhone-Poulenc Agrochimie

Francois Guigues

Stephane Trinh

Gilles Peris-y-Saborit

Daniel Demozay

Guy Borrod

Jacqueline Mourier

Gilles Peris Y Saborit

New 2-phenyl-5,6-dihydro-4-pyrone derivatives and herbicidal compositions in which they are present. They correspond to the general formula: ##STR1## in which: R.sub.1 and R.sub.2, which are identical or different, represent a hydrogen atom or an alkyl radical (C.sub.1 -C.sub.4), or together form an alkylene chain (C.sub.2 -C.sub.6), R.sub.3 represents an alkyl radical (C.sub.1 -C.sub.4), an alkenyl radical (C.sub.2 -C.sub.4), an alkynyl radical (C.sub.2 -C.sub.4), a halogenoalkyl radical (C.sub.1 -C.sub.4) or an alkoxyalkyl radical (C.sub.3 -C.sub.5), Y represents a halogen atom, an alkyl radical (C.sub.1 -C.sub.4) or an alkoxy radical (C.sub.1 -C.sub.4), and n represents an integer which can be equal to 1, 2 or 3, with the proviso that, when n is equal to 2 or 3, the radicals Y can be identical or different. These compounds can be used for selectively destroying weeds in crops such as sunflower, cotton, soft wheat, rice, soya bean, groundnut, bean and tomato plant.

2-Phenyl-5,6-dihydro-4-pyrone derivatives and herbicidal compositions in

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.

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

Novel isoxazolyl-alkyl thiolcarbamates and novel herbicidal compositions containing the novel thiolcarbamates are disclosed wherein the thiolcarbamates are of the formula: ##STR1## in which R.sub.1 and R.sub.2 are identical or different and each represents a hydrogen atom, a linear or branched alkyl radical containing 1 to 6 carbon atoms, a cycloalkyl radical containing 3 to 6 carbon atoms, an alkenyl radical containing 2 to 4 carbon atoms, an alkoxy radical containing 1 to 6 carbon atoms, an alkoxyalkyl radical in which each alkyl part contains 1 to 4 carbon atoms, an optionally substituted aryl radical, an optionally substituted aralkyl radical in which the alkyl part contains 1 to 4 carbon atoms, or a saturated or unsaturated heterocyclic radical which has 5 to 6 chain members and contains, as the hetero-atom, an oxygen, nitrogen or sulphur atom, or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are bonded form a saturated or unsaturated, optionally substituted heterocyclic structure which has 5 to 6 chain members and can contain, as a hetero-atom, an oxygen atom in addition to the nitrogen atom, R.sub.3 represents a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms and Y and Y' are identical or different and each represents a hydrogen or halogen atom, an alkyl radical containing 1 to 6 carbon atoms, a trifluoromethyl radical or an optionally substituted aryl radical. The new thiolcarbamates are useful in the form of herbicidal compositions for the selective destruction of weeds in crops of maize, groundnuts, rape, cotton, soya, beans, sunflowers, wheat and rice.

Isoxazolyl-alkyl thiocarbamates and herbicidal compositions thereof

Selective herbicides useful for the destruction of weeds in crops such as wheat, maize (corn), rice, cotton, groundnuts and soya, correspond to the following formula: ##STR1## in which R.sub.1 is an alkyl of 2-4 carbons, preferably isopropyl, R.sub.2 is an alkyl of 1-4 carbons, preferably methyl, and X is halogen, preferably chloro or fluoro.

Growing community of inventors

Rillieux, France

Francois Guigues