1H, 13C NMR, FT-IR as well as PM5 semiempirical studies of new hydrazone of gossypol with 2,20-diethoxyethyl hydrazine

A new hydrazone of gossypol with 2,20-diethoxyethyl hydrazine (GHOE) has been synthesised and its structure has been studied by FT-IR, 1H NMR, 13C NMR as well as PM5 semiempirical methods. All the studies provide clear evidence of the existence of the GHOE in the solution in the N-imine–N-imine tautomeric form. The structure and the spectroscopic behaviour of this tautomer are discussed in details. q 2005 Elsevier B.V. All rights reserved.