Abstract: A process for the preparation of arylbenzylamines by the reaction of arylamines with a benzyl chloride, wherein the reaction is carried out in the presence of both a phase-transfer catalyst and a base selected from the group consisting of the inorganic bases and salts of weak organic acids.

Abstract: A process for combating the growth of unwanted plants, wherein the soil or the plants are treated with a compound of the formula ##STR1## where Ar denotes substituted or unsubstituted phenyl or naphthyl, R.sup.1 denotes hydrogen or methyl, R.sup.2 denotes hydrogen or alkyl, R.sup.3 denotes alkyl, cycloalkyl, alkenyl, alkynyl, or substituted aralkyl, and Az denotes substituted or unsubstituted pyrazole, imidazole or triazole, or a metal complex thereof, and herbicides for carrying out the process.

Abstract: A process for the preparation of 3,4-dichlorobenzotrihalides of the formula I ##STR1## where X is fluorine or chlorine, by reacting the corresponding 4-monochlorobenzotrihalides with chlorine gas in the presence of a catalytic amount of a Lewis acid, wherein the reaction mixture is recycled by means of a pump in a circulatory apparatus with static mixers and the amount of chlorine equivalent to the conversion of the corresponding 4-monochlorobenzotrihalide is introduced at 20.degree.-120.degree. C.

Abstract: Fluoroethoxyphenyl (di)thiophosphates of the formula ##STR1## where R.sup.1 is alkyl of 1 to 3 carbon atoms, R.sup.2 is alkyl of 1 to 5 carbon atoms, alkoxyalkyl or alkylthioalkyl, each of 2 to 8 carbon atoms, or cycloalkyl of 3 to 6 carbon atoms, R.sup.3, R.sup.4 and R.sup.5 independently of one another are each hydrogen, fluorine, chlorine, bromine or cyano, or alkyl of 1 to 4 carbon atoms which is unsubstituted or substituted by halogen, cyano, alkoxy or alkylthio, X is oxygen or sulfur, and Y is hydrogen, fluorine, chlorine or bromine, their preparation and their use as pesticides.

Abstract: A process for the preparation of 2,4-dichloro- or 2-methyl-4-chlorophenoxyacetic acid or .alpha.-2,4-dichloro- or .alpha.-2-methyl-4-chlorophenoxypropionic acid by reacting phenoxyacetic or 2-methylphenoxyacetic acid or .alpha.-phenoxypropionic or .alpha.-2-methylphenoxypropionic acid with chlorine in water, wherein phenoxyacetic acid or phenoxypropionic acid is precipitated from an aqueous solution thereof, chlorine gas is passed into the resulting suspension of phenoxyacetic or 2-methylphenoxyacetic acid or .alpha.-phenoxypropionic or .alpha.-2-methylphenoxypropionic acid in water at from 30.degree. to 70.degree. C. at a rate not exceeding the rate at which it is consumed in the suspension, until from 100 to 110% of the theoretically required amount of chlorine gas has been taken up by the suspension, and the 2,4-dichloro- or 2-methyl-4-chloro-phenoxyacetic acid or .alpha.-2,4-dichloro- or .alpha.-2-methyl-4-chloro-phenoxypropionic acid is isolated from the suspension.

Abstract: A process for combating the growth of unwanted plants, wherein the soil or the plants are treated with a compound of the formula ##STR1## where Ar denotes substituted or unsubstituted phenyl or naphthyl, R.sup.1 denotes hydrogen or methyl, R.sup.2 denotes hydrogen or alkyl, R.sup.3 denotes alkyl, cycloalkyl, alkenyl, alkynyl, or substituted aralkyl, and Az denotes substituted or unsubstituted pyrazole, imidazole or triazole, or a metal complex thereof, and herbicides for carrying out the process.

Abstract: Difluoromethoxyphenyl thiophosphates of the formula I ##STR1## where R.sup.1 is alkyl of not more than 3 carbon atoms, R.sup.2 is unsubstituted or substituted alkyl of not more than 5 carbon atoms, Y is hydrogen or chlorine, X is oxygen or sulfur and R.sup.3, R.sup.4 and R.sup.5 are each hydrogen, halogen, nitrile, alkoxy or alkylthio, each of not more than 4 carbon atoms, or unsubstituted or substituted alkyl of not more than 4 carbon atoms, their preparation and their use as agents for controlling pests, in particular insects and other arthropods.

Abstract: Trifluoromethoxyphenyl-(di)-thiophosphoric acid esters of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and X have the meanings given in the description, and their use in pest control.

Abstract: 2-Aryloxy-2-halopropionic acid compounds are prepared by reacting 2-aryloxypropionic acid compounds with N-halocarboxylic acid imides in the presence of aliphatic halohydrocarbons as solvents, and of from 0.0001 to 0.001 mole of halogen per mole of N-halocarboxylic acid imide, from 0.005 to 0.05 per cent by weight of water, based on N-halocarboxylic acid imide, and from 0.0005 to 0.005 mole of azo-bis-isobutyronitrile and/or dibenzoyl peroxide, per mole of N-halocarboxylic acid imide.The end products obtainable by the process of the invention are valuable starting materials for the preparation of drugs, crop protection agents and dyes.