Process for the preparation of .beta.-halogeno-tert.-alkyl-carboxylic acid chlorides
AssigneeBayer Aktiengesellschaft
InventorRudiger Schubart
Life of this patent
Estimating the term…
Abstract
The invention relates to a new process for the preparation of known .beta.-halogeno-tert.-alkylcarboxylic acid chlorides of the general formula (I) ##STR1## in which X represents chlorine, Y represents hydrogen or chlorine, R.sub.1 represents in each case straight-chain or branched lower alkyl or halogeno alkyl and R.sub.2 represents in each case straight-chain or branched lower alkyl or halogeno alkyl or optionally halogen- and/or trifluoromethyl-substituted phenyl, where tert.-alkylcarboxylic acid chlorides of the general formula (II) ##STR2## in which R.sup.1 and R.sup.2 are defined as above, are reacted with elementary chlorine optionally under irradiation or in the presence of free-radical catalysts.
Claims7
A process for the preparation of .beta.-halogeno-tert.-alkylcarboxylic acid chlorides of the formula (I) ##STR7## in which X represents chlorine,
- Y represents hydrogen or chlorine,
- R.sub.1 represents in each case straight-chain or branched lower alkyl or halogeno alkyl and
- R.sub.2 represents in each case straight-chain or branched lower alkyl or halogeno alkyl or represents optionally halogen- and/or trifluoromethyl-substituted phenyl,
- which comprises reacting a tert.-alkylcarboxylic acid chloride of the formula (II) ##STR8## in which R.sup.1 and R.sup.2 have the definition given above with elemental chlorine in the liquid phase, optionally under irradiation or in the presence of free-radical catalysts in a suitable apparatus.
Dependencies are inferred from the claim text.