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DOI: 10.1055/sos-SD-010-00864

Gallagher, P. T.Science of Synthesis, (200110708.

Carbazoles are available either by thermolytic or photolytic cleavage of nitrogen from azidobiphenyls. Of the two procedures, thermolysis proceeds in higher yields and has a straightforward product-isolation procedure. One advantage of the photolysis is that it proceeds at room temperature and would therefore be compatible with thermally labile functional groups. For further details see Houben-Weyl, Vol.E16a, pp159168; Vol.E6a, p931; Vol.E19b, p1015.