Pyrolysis of 2-azido-naphthalene, -anthraquinone, and various azido-heterocycles in a mixture of polyphosphoric and acetic acid results in fusion of an oxazolo-moiety on to the parent system. The scope of this convenient oxazole synthesis in its widest sense is discussed.
E. B. Mullock and H. Suschitzky, J. Chem. Soc. C, 1968, 1937 DOI: 10.1039/J39680001937
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