Preparation of .alpha.-keto-carboxylic acids from acyl halides
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United States of America Patent
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Nov 6, 1984
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N/A
app pub date -
Jul 28, 1983
filing date -
Jul 28, 1983
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Expired
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Abstract
A process for the production of .alpha.-keto-carboxylic acids of the general formula: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and are hydrogen, hydrocarbyl radicals, substituted hydrocarbyl radicals or hydrocarbyloxy radicals by reacting an acyl halide of the formula: ##STR2## wherein R.sub.1 and R.sub.2 are as defined above and X represents halogen, in a liquid solvent medium, with an alkali metal tricarbonyl[triphenylphosphine]cobaltate complex of the formula: MCo(CO).sub.3 Ph.sub.3 wherein M is an alkali metal to form the corresponding phenylacetyl tricarbonyl[triphenylphosphine]cobalt complex of the formula: ##STR3## wherein R.sub.1 and R.sub.2 are as defined above, reacting the acylcobaltcarbonyl complex thus formed with carbon monoxide and an alkali metal hydroxide or an alkaline earth metal hydroxide at elevated temperature and elevated pressure in a liquid solvent medium to form the corresponding alkali metal salt or alkaline earth metal salt of the product .alpha.-keto-carboxylic acid and thereafter acidifying the salt of the .alpha.-keto-carboxylic acid to form the product .alpha.-keto-carboxylic acid.
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