Abstract: Disclosed are selected biuret derivatives of 3-trihalomethyl-1,2,4-thiadiazole compounds of the formula: ##STR1## wherein R.sub.1 is a CCl.sub.3 or CF.sub.3 group; R.sub.2 and R.sub.3, separately, are either hydrogen or a lower alkyl group of 1 to 4 carbon atoms or an aryl group having 6 to 8 carbon atoms; and R.sub.4 and R.sub.5 are either hydrogen or a lower alkyl group of 1 to 4 carbon atoms or an aryl group having 6 to 8 carbon atoms or an acyl group having 1 to 8 carbon atoms, with the proviso that either R.sub.4 or R.sub.5, or both, must be a hydrogen.

Abstract: A process for producing 3-trichloromethyl-5-loweralkylamino-1,2,4-thiadiazole compounds by the reaction of a N-loweralkylisothiocyanate with a N-halotrichloroacetamidine in the presence of a base. The N-halotrichloroacetamidine compound may be added to the reaction mixture or, instead, generated in situ.

Abstract: Process for the preparation of perfluoroalkyl-substituted heterocyclic compounds wherein perfluoroalkyl bromide is reacted with the heterocyclic substrate in a vapor phase under anhydrous conditions at temperatures from about 300.degree. C to about 800.degree. C in the presence of a catalytic amount of a catalyst selected from the group of iodine or an iodine generating compound.

Abstract: Improved method of isolating and recovering 2,4-dinitro-N-substituted-1,3-phenylenediamine compounds having a trifluoromethyl substituent in the 6-position of the aromatic ring from the reaction medium.

Abstract: Perfluoroalkyl substituted aromatic or heteroaromatic compounds are prepared by reacting a perfluoroalkyl bromide with an aromatic compound in the vapor phase in the presence of a catalytic amount of iodine or an iodine generating compound.

Abstract: Selected 5-substituted-2-fluoroanilines, useful in preparing dyes and herbicides, are prepared by reacting a selected 3-substituted nitrobenzene with anhydrous hydrogen fluoride and a deoxygenating agent at a temperature of 0.degree.-300.degree. C. under a pressure of 15 to 3000 p.s.i.a. Substituents in the 3 position include hydroxyl and lower alkoxyl groups.

Abstract: p-Fluoro-m-phenylenediamine is prepared by deoxygenation and hydrofluorination of m-nitroacetanilide by the reaction of m-nitroacetanilide with anhydrous hydrogen fluoride at a temperature of 0.degree.-230.degree.C under a pressure of 15 to 1,500 psia in the presence of certain sulfur and phosphorus containing deoxygenating agents.