Several acetyl-oxazoles have been prepared by condensation of aromatic aldehydes with hydroxyimino-β-diketones in the presence of dry hydrogen chloride and reduction of the intermediate N-oxides. The acetyl-oxazoles were oxidised to the corresponding acids with sodium hypobromite.
A. W. Allan and B. H. Walter, J. Chem. Soc. C, 1968, 1397 DOI: 10.1039/J39680001397
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