Geometrical lsomers of 2, 4-Dinitrophenylhydrazones of Unsymmetrically Substituted Benzophenones

Abstract

The isolation and structural elucidation of geometrical isomers of 24-dinitrophenylhydrazones(DNP) of seven unsymmetrically substituted benzophenones are described.
The reaction of benzophenones with 2, 4-dinitrophenylhydrazine by the usual procedure led to a mixture of E- and Z-isormers of the corresponding DNP's, which were then separated by fractional crystallization of using ethyl acetete as the solvent. The melting points together with some physical properties are summerized in Table1.