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DOI: 10.1055/sos-SD-011-00557

Boyd, G. V.Science of Synthesis, (200211446.

Vinylene carbonate (252) reacts with amides of aromatic acids in the presence of polyphosphoric acid to yield 2-aryloxazoles 253 (Scheme 112).[‌180‌] The reaction fails with the amides of phenylacetic, phenoxyacetic and 4-methylbenzoic acid.

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