Abstract: A process for the storage and transport of chloroformic acid esters in tanks or pipelines which have a plastic inside surface, which comprises using a plastic having a total nitrogen content of from 0 to 100 ppm by weight, where this plastic forms from 20 to 100% of the inside surface, and the use of tanks or pipelines of this type for the storage and transport of chloroformic acid esters.

Abstract: The invention relates to a process for the preparation of acid chlorides by reaction of carboxylic acids, carboxylic anhydrides, cyclic carboxylic esters or sulfonic acids with phosgene in the presence of a catalytic amount of a compound from the group consisting of N,N,N′,N′-tetrasubstituted amidinium halides (I), N,N,N′-trisubstituted amidinium hydrohalides (II) and N,N,N′-trisubstituted amidines (III).

Abstract: Carbonyldiimidazoles of the formulae Ia, Ib, Ic or mixtures thereof where R1 is C1-4-alkyl and R2 is hydrogen or methyl, and tert-butyl esters derived therefrom are described.

Abstract: The invention relates to a process for the preparation of &agr;-chloronitriles by reaction of cyanohydrins of aldehydes or ketones with phosgene using a phosphine oxide as catalyst.

Abstract: In a process for preparing carbonyldiimidazole of the general formulae Ia, Ib, Ic or mixtures thereof where R1 is hydrogen or a C1-4-alkyl radical and R2 is hydrogen or a methyl radical, by reacting at least one imidazole of the general formulae IIa and IIb in which R1 and R2 have the abovementioned meaning, with phosgene in an inert solvent, stoichiometric amounts, based on the imidazoles, of an organic nitrogen base which has a lower pKb than imidazole are added to the reaction mixture.

Abstract: In a process for chlorinating ketones which, apart from the carbonyl group, are inert in respect of triarylphosphine dichlorides, except for cyclopropyl methyl ketone, in which the ketones are reacted with a chlorinating agent in the presence of triarylphosphine oxides, the amount of triarylphosphine oxide is from 0.1 to 10 mol %, based on the amount of ketone. The ketones preferably have a least one CH-acid proton in the &agr; position to the carbonyl group.

Abstract: In a continuous process for preparing propargyl chloride by reacting propargyl alcohol with a chlorinating agent in the presence of a catalyst, the chlorinating agent, propargyl alcohol and from 0.1 to 10 mol % of the catalyst, based on the amount of propargyl alcohol, are continuously metered into a reaction zone and reacted at from 40 to 70° C.

Abstract: The present invention provides process for the preparation of chlorocarbonyl chlorides of the formula I R1—CHCl—Y—COCl  (I), where R1 is for example hydrogen or C1- to C20-alkyl and Y is for example a saturated or mono- or polyolefinically unsaturated C2-C8-alkylene chain, by reacting lactones with a chlorinating agent in the presence of a urea compound.

Abstract: The present invention relates to a process for preparing alkyl, alkenyl and alkynyl chlorides from alcohols by reaction with a chlorinating agent in the presence of a catalyst, wherein the catalyst is a urea compound.

Abstract: The invention relates to a process for the halogenation of cyclopropylmethyl ketone with at least one dihalo-triorganophosphorane of the general formula I R3PHal2   (I), in which the radicals R can be the same or different and denote a saturated or unsaturated aliphatic C1-C20 hydrocarbon radical, a phenyl or (C1-C4 alkyl)phenyl radical, which may be optionally substituted by one or two fluorine, chlorine and/or nitro groups, P stands for phosphorus and Hal denotes chlorine, bromine, or iodine, at a temperature of from 800° to 130° C.

Abstract: A process for preparing addition polymers which contain carbamate units comprises reacting polyethyleneimines or addition polymers which contain vinylamine units of the formula where R1 is hydrogen or C1-C6-alkyl, with haloformic esters, the carbamate-functionalized polyethyleneimine or vinylamine polymers thus obtainable being useful as retention, drainage and flocculation aids and as fixatives in papermaking, as protective colloids for the preparation of aqueous alkyldiketene dispersions and as dispersants for the preparation of aqueous filler slurries.

Abstract: A catalyst used for preparing thiochloroformates by reacting thiols with phosgene is a cyclic urea or cyclic thiourea which may be in the form of a salt obtainable by reaction with a hydrohalic acid or phosgene.