Abstract: N-di-n-propyl-2,6-dinitro-4-trifluoromethylaniline ("Trifluralin") with a low content in nitrosamines (less than 1 ppm) is prepared by reacting 4-trifluoro-2,6-dinitro-chlorobenzene with di-n-propylamine under the following critical conditions:feeding to the chlorobenzoderivative the di-n-propylamine containing an alkali metal hydroxide or an alkaline carbonate so that the pH value of the reaction mass is comprised between 7 and 7.5;regulating the temperature of the reaction mass so that it does not exceed 70.degree. C.; andoperating in the presence of at least 50% by weight of water in the reaction mass.

Abstract: An adduct of zinc chloride and benzyl-N,N-di-sec. butyl-thiolcarbamate, and use thereof as catalyst for preparing benzyl-N,N-di-sec.butyl-thiolcarbamate from carbamoyl chloride and benzyl mercaptan are disclosed.

Abstract: A process is disclosed for quaternarizing 4,4'-dipyridyl diacetate to N,N'-dimethyl-4,4'-dipyridylium dihalide by reaction with an alkyl halide, preferably a lower alkyl halide such as methyl chloride, the reaction being carried out by:Using acetic acid as solvent for the 4,4'-dipyridyl diacetate in amounts of at least 1:1 by weight in respect of the diacetate subjected to reaction; andHeating the reactants at temperatures ranging from 60.degree. to 150.degree. C. and at pressures ranging from 2 to 10 kg/cm.sup.2. The acetic acid used as a solvent may be utilized for further quaternarizations of 4,4'-dipyridyl diacetate. Preferably the acetic acid is recycled to the zone of oxidation of diacetyl-tetrahydrodipyridyl, the resulting product being quaternarized in the same recycled acetic acid.