A number of alkyl-substituted aromatic carboxylic acids, in which an alkyl substituent and the carboxy group are situated ortho to each other, could be synthesized by treatment of O-alkyl O′-trimethylsilyl ketene acetals with several aryl halides in the presence of an excess of NaNH2 at room temperature followed by hydrolysis with aqueous hydrochloric acid.
S. M. Ali and S. Tanimoto, J. Chem. Soc., Perkin Trans. 1, 1989, 915 DOI: 10.1039/P19890000915
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