89074-51-1Relevant articles and documents
TAUTOMERISM IN THE SERIES OF BENZOYLACETONE AND BENZOYLACETALDEHYDE ACYLHYDRAZONES
Yakimovich, S. I.,Nikolaev, V. N.,Kutsenko, E. Yu.
, p. 2037 - 2043 (2007/10/02)
By PMR spectroscopy it was shown that the acylhydrazones of benzoylacetone exist in the cyclic 5-hydroxypyrazoline form in solutions in deuterochloroform and as a mixture of the enehydrazine and 5-hydroxypyrazoline forms in solutions in DMSO-d6.In solutions in DMSO-d6 the acylhydrazones of benzoylacetaldehyde mostly represent tautomeric mixtures of the hydrazone, enehydrazine, and cyclic 5-hydroxypyrazoline forms.In both series of compounds increase in the volume of the substituent in the acyl part shifts the tautomeric equilibrium toward the enehydrazine form.