The reaction of boron trichloride with an ortho-aryl and ortho-diazoaryl phenyl azides at room temperature yielded fused azoles via 1,5-cyclization of a probable singlet nitrenium ion intermediate, arising from displacement of molecular nitrogen from the azido group.
P. Zanirato, J. Chem. Soc., Chem. Commun., 1983, 1065 DOI: 10.1039/C39830001065
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