Preparation of carbonyl halides of more than 7 carbon atoms
AssigneeBASF SE
InventorsEnrique Freudenberg, Peter Wittmer, Andreas Hohmann, Hans-Heinrich Bechtolsheimer
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Abstract
Carbonyl halides of the general formula I ##STR1## where R is an organic radical of more than 7 carbon atoms and X is chlorine or bromine, are prepared by reacting carboxylic acids of the general formula II ##STR2## where R has the abovementioned meaning, with phosphorus chlorides or bromides by treating these reaction mixtures with carboxamide/hydrochloride or hydrobromide mixtures which are not homogeneously miscible with the carbonyl halides I and then separating off the carboxamide hydrochloride or hydrobromide phase.
Claims17
In a process for preparing a carbonyl halide of the formula ##STR6## where R is an organic radical of more than 7 carbon atoms and X is chlorine or bromine, by chlorinating or brominating a carboxylic acid of the formula ##STR7## where R has the abovementioned meaning, in a reaction with a phosphorus chloride or bromide, the improvement which comprises:
- treating the reaction mixture obtained by said chlorination or bromination with a carboxamide/hydrochloride or hydrobromide mixture which is not homogeneously miscible with the carbonyl halide I, and then separating off the carboxamide hydrochloride or hydrobromide phase.
Dependencies are inferred from the claim text.