Bucherer Carbazole Synthesis

H. T. Bucherer, F. Seyde, J. Prakt. Chem. 77(2), 403 (1908).

Formation of carbazoles from naphthols or naphthylamines, aryl hydrazines and sodium bisulfite:

Reviews: N. L. Drake, Org. React. 1, 114 (1942); E. Enders, Houben-Weyl 10/2, 250 (1967). Cf. Borsche-Drechsel Cyclization.