JOURNAL OF THE CHEMICAL SOCIETY, PERKIN TRANSACTIONS 1, #9, 1991, 2139-2145
T. Benincori, E. Brenna, F. Sannicolo
Studies on the Fischer indole synthesis: rearrangements of five-, six- and seven-membered cyclic hydrazones of pyrazoline, tetrahydropyridazine and tetrahydro-1,2-diazepine series in polyphosphoric acid
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http://dx.doi.org/10.1039/P19910002139