Abstract:
The invention relates to a method for producing chlorocarboxylic acid chlorides of formula (I) R1-CHCl-Y-COCl, wherein R1 represents hydrogen or C¿1? to C20 alkyl for example and Y represents a saturated or a mono- or poly-olefinically unsaturated C2-C8 alkene chain for example, by reacting lactones with a chlorination agent in the presence of a urea compound.
Abstract:
The invention concerns a process for halogenating cyclopropylmethyl ketone with at least one dihalogen triorganophosphorane of the general formula (I): R3PHal2, in which the R groups can be the same or different and designate a saturated or unsaturated aliphatic C1-C20 hydrocarbon group, a phenyl or C1-C4 alkylphenyl group which can optionally be further substituted by one to two fluorine, chlorine and/or nitro groups, P means phosphorus and Hal means chlorine, bromine or iodine, at 80 to 130 °C, the dihalogen triorganophosphorane of the general formula (I) being prepared in situ from triorganophosphane oxide or triorganophosphane sulphide of the general formula (II), R3PA, in which R has the meaning given under formula (I) and A stands for oxygen or sulphur, with a halogenation reagent. The process is characterized in that the triorganophosphane oxide or triorganophosphane sulphide is used in catalytic amounts. The invention also concerns the halogenation product of the cyclopropyl ketone obtained according to this process and a process for reacting it to form cyclopropylacetylene.
Abstract:
The invention relates to a method for producing chlorocarboxylic acid chlorides of formula (I), wherein R?1 and R2¿, independently from one another, mean a hydrogen atom, an organic radical containing carbon, a halogen, a nitro or cyano group and Y means an alkylene chain having 1 to 10 carbon atoms in the chain which is unsubstituted or is substituted by organic radicals that contain carbon, by halogen, nitro and/or cyano groups, whereby the alkylene chain can be interrupted by an ether-, thioether-, tertiary amino- or keto group, whereby the organic radicals of Y and/or R1 and/or R2 can be connected to one another and thereby form a non-aromatic system, whereby said radicals contain carbon, by converting a lactone of formula (II), wherein R1, R2 and Y have the aforementioned meanings, using a hydrogen chloride and phosgene in the presence of a catalyst. Hydrogen chloride is added before and/or while phosgene is added. The hydrogen chloride is only introduced at a temperature of at least 60 °C. A pyridine compound is used as the catalyst.
Abstract:
The invention relates to a method for producing acid chlorides by converting carboxylic acids with carbon oxychlorides or thionyl chloride in the presence of a catalyst adduct of an N,N-disubstituted formamide of general formula (I) and carbon oxychloride or thionyl chloride. In the formula, R and R , independently from one another, mean C1- to C4-alkyl or R and R together mean a C4- or C5-alkylene chain. According to the inventive method, hydrogen chloride is added during and/or after the conversion.
Abstract:
The invention relates to a method for producing isocyanates by reacting the corresponding primary amines with phosgene in an inert solvent, while using 0.01 to 50 mole percent of a sulfoxide, a sulfone or mixtures thereof, based on the total quantity of the primary amine and isocyanate produced in the reaction solution.
Abstract:
The invention relates to a method for producing o-chloromethyl benzoic acid chlorides of formula (I), in which R1 to R4 can be the same or different and represent hydrogen C¿1?-C4 alkyl, halogen or trifluoromethyl, by reacting benzo-condensed lactones of formula (II), in which R?1 to R4¿ have the above-mentioned meaning, with thionyl chloride. The inventive method is characterized in that the reaction is carried out in the presence of catalytic quantities of a Lewis acid and in the presence of catalytic quantities of a phosphine derivative.
Abstract:
A method for producing carbonyldiimidazole from imidazole and phosgene in an inert solvent, wherein the coupled imidazole-hydrochloride product is separated from the obtained reaction mixture in the form of a melt by means of phase separation.
Abstract:
The invention relates to a method for producing chlorocarboxylic acid chlorides of formula (I), wherein R?1 and R2¿, independently from one another, mean a hydrogen atom, an organic radical containing carbon, a halogen, a nitro or cyano group and Y means an alkylene chain having 1 to 10 carbon atoms in the chain which is unsubstituted or is substituted by organic radicals that contain carbon, by halogen, nitro and/or cyano groups, whereby the alkylene chain can be interrupted by an ether-, thioether-, tertiary amino- or keto group, whereby the organic radicals of Y and/or R1 and/or R2 can be connected to one another and thereby form a non-aromatic system, whereby said radicals contain carbon, by converting a lactone of formula (II), wherein R1, R2 and Y have the aforementioned meanings, using a chlorination means in the presence of a chlorination catalyst and in the presence of a boron compound.
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.