NMR, FT-IR as well as PM5 semiempirical studies of new hydrazone of gossypol with 3-oxa-n-butylhydrazine

A new hydrazone of gossypol with 3-oxa-n-butylhydrazine (GHOB) has been synthesised and its structure has been studied by FT-IR, 1H NMR, 13C NMR as well as PM5 semiempirical methods. All the results obtained provide clear evidence of the existence of the GHOB in the solution in the N-imine-N-imine tautomeric form. The structure of this tautomer is discussed in details.