The cyclization of 5-chloro-2-pentanone with hydrazines

It is shown that the comparative basicities of the - and -nitrogen atoms in -chloroketone hydrazones exert a considerable influence on the course of the intramolecular cyclization.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1273–1275, September, 1970.