Abstract:
The invention relates to a method for producing thiochloroformates by reacting thiols with phosgene in the presence of a catalyst. According to the inventive method, the catalyst used is a urea or cyclic thio-urea which can exist in the form of salts obtained by reaction with halogen acids or phosgene.
Abstract:
The invention relates to a method for purifying acid chlorides which have been produced by converting carboxylic acids with carbon oxychloride or thionyl chloride in the presence of a catalyst adduct. The acid chlorides are treated with a hydro halide of carboxylic acid amides of general formula (I), wherein R1 stands for hydrogen or C¿1?- to C3-alkyl; R?2 and R3¿, independently from one another, mean C¿1?- to C4-alkyl or R?2 and R3¿ together mean a C¿4?- or C5-alkylene chain. The thus purified acid chloride is isolated by separation said acid chloride from the carboxylic acid amide hydro halide-phase.
Abstract:
The invention relates to a method for producing isocyanates by the reaction of the corresponding primary amines with phosgene in an inert solvent, whereby 0.01 to 50 mole % of a sulphonic acid amide is used, based on the total amount of primary amine and of formed isocyanate in the reaction solution.
Abstract:
The invention relates to a method for the intrinsically safe handling of 3-chlorpropyne in the presence of a diluent, which has a boiling point under normal pressure in the range of -50 °C (223 K) to 200 °C (473 K). According to the method, the concentration of 3-chloropropyne in the liquid phase and in the gaseous phase is maintained below the concentrations at which deflagration occurs, by means of the type and quantity of the diluent, the temperature and the total pressure of the system. The invention also relates to the use of 3-chloropropyne produced, stored or transported in this manner for the synthesis of dyes, pharmaceutical and agricultural active ingredients, electroplating auxiliary agents, disinfection agents, steroids and growth hormones.
Abstract:
The invention relates to a method for producing thiochloroformates by reacting thiols with phosgene in the presence of a catalyst. According to the inventive method, the catalyst used is a urea or cyclic thio-urea which can exist in the form of salts obtained by reaction with halogen acids or phosgene.
Abstract:
The invention relates to a method for the production of α-chloronitrile by reacting cyanohydrins of aldehydes or ketones with a phosgene using phosphine oxide as catalyst.
Abstract:
The invention relates to a method for producing alkyl chloride, alkenyl chloride and alkinyl chloride from alcohols by means of a reaction with a chlorinating agent in the presence of a catalyst which is a urea compound of formula (I): R?1R2N-CX-NR3R4¿ and/or a urea compound of formula (II) and/or a urea compound of formula (III).
Abstract:
The invention relates to carbonyldiimidazoles having the general formulae (Ia), (Ib), (Ic), or their mixtures. In these formulae, R1 stands for a C¿1-4?-alkyl radical and R?2¿ is hydrogen or a methyl radical. The invention also relates to tert-butyl esters derived from these carbonyldiimidazoles.
Abstract:
The invention relates to a method for producing polymers containing carbamate units, wherein polyethylene imines or polymers containing vinyl amine units of formula (III) in which R1 = H or C¿1?-C6-alkyl are made to react with halogen formic acid esters. The invention also relates to the use of the polyethylene imines containing carbamate groups thus obtained or polymers containing vinyl carbamate units as retention agents, dehydrating agents, flocculants and fixing agents in the production of paper, as a protective colloid for the production of aqueous alkyl diketene dispersions and as a dispersing agent for the production of accumulated aqueous filling material slurries.