Monatshefte fur Chemie p. 517 - 523 (1990)
Update date:2022-08-03
Topics:
Silwanis, Basim Azmy
Moussa, Adel
A series of aroylacetaldehyde aroylhydrazones were prepared and characterized.Their uv and 1H nmr spectra suggest the enol-imine structure rather than the keto-imine form. The pKa values of these aroylhydrazones were measured and correlated with the Hammett substitution constants.It was observed that benzoylacetaldehyde substituted in the p-position could be cyclized to form the 5-hydroxy-2-pyrazolines by refluxing in acidified ethanol, while formyldeoxybenzoin only gives the corresponding pyrazole due to steric requirements of the two phenyl groups.
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(1990)
