Abstract: The invention relates to new 2,3-dihydro-4-pyrone derivatives.These compounds correspond to the formula: ##STR1## in which R.sub.2 represents an alkyl radical (C.sub.2 -C.sub.3) and R.sub.3 represents and alkyl radical (C.sub.1 -C.sub.4), an alkenyl radical (C.sub.3 -C.sub.5) or an alkynyl radical (C.sub.3 -C.sub.5).They can be used for destroying weeds in crops, in particular sunflower and cotton crops.

Abstract: A composition for combatting fungal and bacterial diseases in plants is disclosed which contains, as the active ingredient, a compound of the formula: ##STR1## in which: R.sub.1 is hydrogen or an alkyl radical containing from 1 to 6 carbon atoms, R.sub.2 is an alkyl radical containing from 1 to 18 carbon atoms, R.sub.1 and R.sub.2 can additionally form an ethylene or propylene chain which is optionally substituted by alkyls containing from 1 to 3 carbon atoms, and R.sub.3 and R.sub.4, which are identical or different, are hydrogen, an alkyl radical containing from 1 to 18 carbon atoms, a cycloalkyl radical containing from 3 to 7 carbon atoms, an alkenyl radical containing from 3 to 18 carbon atoms, the phenyl radical or the benzyl radical, in association with an inert carrier which is acceptable in agriculture.

Abstract: There are provided herbicidal 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoyl derivatives of imino-dithiolanes.

Abstract: There are provided herbicidal trithione derivatives of benzoic acids.

Abstract: There are provided herbicidal derivatives of 5-phenoxy-2-nitrofuran-3-carboxylic acid.

Abstract: Herbicidal derivatives of 5-phenoxy-4(3H)-quinazolinone-1-oxide of the formula: ##STR1## wherein X.sub.1 is trihalomethyl; X.sub.2 is halo; R.sub.1 is H or (C.sub.1 -C.sub.5) alkyl, which may be unsubstituted or substituted with hydroxy, alkoxy, cyano, halo or COO alkyl; and R.sub.2 is H.

Abstract: There are provided herbicidal N-(5,5-dimethyloxazolideneyl-2,4-dione) 5-(substituted phenoxy or pyridyloxy)-2-substituted benzamides.

Abstract: Process for the preparation of malathion by reacting O,O-dimethyl-dithiophosphoric acid with ethyl maleate in the presence of a solvent which forms a heterogeneous azeotrope with the O,O-dimethyl-dithiophosphoric acid.

Abstract: Organothiophosphorous compounds, e.g., Merphos, which contain or develop malodorous mercaptan impurities during storage, are protected against such odor development by the addition of minor amounts (0.1 to 10%) of a ketone, especially in the presence of a catalyst such as cuprous chloride or p-toluene sulfonic acid in a concentration range of 0.01 to 0.1%. Formulated products are also claimed.

Abstract: There are provided N(carboxymethyl-N-(phosphonomethyl)-5-(2-chloro-4-trifluoromethyl phenoxy)-2-nitrobenzamide and salts thereof.

Abstract: Compounds having the formula ##STR1## in which R is alkyl of 1 to 8 carbon atoms, haloalkyl of 1 to 8 carbon atoms, alkenyl of 2 to 8 carbon atoms, haloalkenyl of 2 to 8 carbon atoms, alkynyl of 2 to 8 carbon atoms or haloalkynyl of 2 to 8 carbon atoms;R.sub.1 is aryl;R.sub.2 is tertiary alkyl of 4 to 8 carbon atoms; are disclosed as well as their use as insecticides and nematocides, e.g., in controlling Corn rootworm and Southern Armyworm.

Abstract: Compounds useful as intermediates for insecticides and nematocides having the formula ##STR1## in which R is alkyl of 1 to 6 carbon atoms;R.sub.1 is branched alkyl of 3 to 8 carbon atoms; andX is halogenare disclosed as well as their preparation by direct reaction of an alkylphosphonothioic dihalide with a branched alkyl thiol.

Abstract: A process for the dechlorination of aromatic nitro or amino compounds consists in reacting anilines or nitrobenzenes which are polysubstituted by chlorine, with hydrogen, under the action of heat, in the presence of iodide or bromide ions, in the liquid phase and at low pressure.The process makes it possible selectively to obtain anilines which are chlorine-substituted in the meta-position.

Abstract: This invention provides a selective dechlorination process that comprises contacting a vaporized mixture of methyl 2,5-dichlorobenzoate and hydrogen, in a molar ratio respectively of 1:3-4, optionally together with between about 1% and about 10% of methanol by weight of methyl 2,5-dichlorobenzoate with a nickel catalyst at a temperature between about 200.degree. C. and about 300.degree. C. and for a residence time of between about 2.0 seconds and about 5.0 seconds.

Abstract: A process for the dechlorination of aromatic nitro or amino compounds consists in reacting anilines or nitrobenzenes which are polysubstituted by chlorine, with hydrogen, under the action of heat, in the presence of cations (Bi, Pb, Sn, Tl, Hg and Ag), in the liquid phase and at low pressure.The process makes it possible selectively to obtain anilines which are chlorine-substituted in the meta-position.

Abstract: There is provided herbicidal 1-(5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoyl)-3-isopropyl-2,1 ,3-benzothiadiazin-4-one-2,2-dioxide. This compound is particularly useful when applied in a post-emergence application to soybean fields containing broadleaf weeds.

Abstract: There is provided herbicidal nitroalkyl 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoates. These compounds are particularly useful when applied in a post-emergence application to soybean fields containing broadleaf weeds.

Abstract: Benzoxazolone is prepared by reacting salicylamide with an alkali metal hypochlorite in an aqueous reaction medium comprising an alkali metal hydroxide, the alkali metals comprising said hypochlorite and said hydroxide necessarily including both sodium ions and potassium ions.

Abstract: A racemic or optically active alkyl 2-chloropropionate is prepared, respectively, from a racemic or optically active alkyl lactate by, in a first step, gradually bringing the alkyl lactate into contact with the thionyl chloride, in the presence of an organic base, while maintaining, in the reaction mixture, an excess of thionyl chloride, relative to the amount of alkyl lactate introduced into this mixture, at a temperature below the decomposition point of the chlorosulphinate of the alkyl lactate, which is formed as an intermediate, and then, in a second step, in heating the reaction mixture resulting from the first step at a temperature which is at least equal to the decomposition point of the chlorosulphinate of the alkyl lactate.The alkyl 2-chloropropionates can be used for the manufacture of the racemic or optically active 2-phenoxypropionic acids.

Abstract: Process for the preparation of 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofuran from ortho-methallyloxyphenol or ortho-methallylpyrocatechol.It consists in heating ortho-methallyloxyphenol or ortho-methallylpyrocatechol in the presence of an aluminum derivative.2,3-Dihydro-2,2-dimethyl-7-hydroxybenzofuran can be used for the synthesis of carbofuran, which is a polyvalent insecticide.