Method for the manufacture of hydroxy aromatic monocarboxylic acids
A method for preparing hydroxy aromatic carboxylic acids, or the ester derivatives thereof, comprises the carbonylation of a hydroxy aromatic bromide in the presence of a catalytic amount of a transition element of group VIII of the Periodic Table on a carbon support, at a pH of above 8, in the absence of any promoter.The reaction is carried out at a temperature in the range of between 140oC to 200oC. The resulting products are obtained in high yields and of high purity. The method has particular applicability to the manufacture of 6-carboxy-2-naphthol and 4-hydroxy-4'-carboxy-biphenyl.
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(2008/06/13)
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