By pyrolysis of various polymethylene bridged benzimidazolyl azides in a mixture of polyphosphoric and acetic acid examples of the new ring system of imidazo[4,5-g]benzoxazole were obtained. Aspects of their ultraviolet and n.m.r. spectra are discussed.
R. Garner and H. Suschitzky, J. Chem. Soc. C, 1967, 74 DOI: 10.1039/J39670000074
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