Preparation of carbonyl halides
AssigneeBASF SE
InventorKaspar Bott
Life of this patent
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Abstract
Carbonyl halides I ##STR1## where R.sup.1 is H, alkyl, cycloalkyl, haloalkyl or halocycloalkyl, R.sup.2 and R.sup.3 are each alkyl, cycloalkyl, haloalkyl or halocycloalkyl and may furthermore be bonded to one another to form a 5-membered to 7-membered ring and X is halogen, are prepared by reacting an alkyl halide II ##STR2## with carbon monoxide under superatmospheric pressure in the presence of a catalytic amount of a) aluminum bromide and in the presence or absence of a solvent or b) aluminum chloride or bromide and in the presence of a halohydrocarbon and a carbonyl halide of the formula III R.sup.4 --CH.sub.2 --CO--Hal III, where R.sup.4 is hydrogen or C.sub.1 -C.sub.4 -alkyl and Hal is halogen.
Claims11
In a process for the preparation of a carbonyl halide of the formula ##STR5## wherein R.sup.1 is hydrogen, alkyl, cycloalkyl, haloalkyl or halocycloalkyl, R.sup.2 and R.sup.3 are each alkyl, cycloalkyl, haloalkyl or halocycloalkyl and may furthermore be bonded to one another to form a 5-membered to 7-membered ring, and X is halogen, by reacting the corresponding halide of the formula ##STR6## wherein R.sup.1, R.sup.2 and R.sup.3 have the same meanings given above, with carbon monoxide under superatmospheric pressure in the presence of a catalytic amount of a Lewis acid, the improvement which comprises:
- carrying out the reaction in the presence of aluminum bromide as a catalyst in an amount of from 0.005 to 0.05 mole per mole of the halide reactant II and, optionally, adding a carboxamide when the reaction is complete to destroy said catalyst.
Dependencies are inferred from the claim text.