substituted schiff bases (hydrazones) 5a-j have been prepared from the starting material 2-chloro pyridine-3-carboxylic acid 1 by a sequence of reactions like reaction with 2-amino-6-nitro benzothiazole (ullamann condensation), thionyl chloride, hydrazine hydrate and different aromatic aldehydes. on cyclocondensation of 5a-j with thioglycolic acid in dry 1,4-dioxane furnished desired compounds ...

substituted schiff bases (hydrazones) 5a-j have been prepared from the starting material 2-chloro pyridine-3-carboxylic acid 1 by a sequence of reactions like reaction with 2-amino-6-nitro benzothiazole (ullamann condensation), thionyl chloride, hydrazine hydrate and different aromatic aldehydes. on cyclocondensation of 5a-j with thioglycolic acid in dry 1,4-dioxane furnished desired compounds ...

An efficient method for the Citric acid-catalyzed synthesis of hydrazones Schiff base using 2,4-dinirtophenyl hydrazine. We have synthesized a series of hydrazones using 2,4-dinirtophenyl hydrazine as a source of amine and substituted aromatic aldehydes and aromatic ketones as a carbonyl source. Synthesized compounds were characterized by FT-IR techniques. Synthesis of above hydrazones using ci...

Oxidative transformations of the aldehydes, ketones, and their azomethine derivatives such as hydrazones, Schiff bases, azines, and oximes are presented and discussed. The oxidants used have been hydrogen peroxide in the presence of selenium compounds as catalysts, peroxycarboxylic acids, and eerie ammonium nitrate. Some of reported reactions have practical value in the synthesis of phenols, es...

Two new macrocyclic hydrazone Schiff bases were synthesized by reaction of succindihydrazide and adipdihydrazide with acetylacetone. Hydrazones have been characterized by elemental analyses and IR, mass, (1)H NMR, and (13)C NMR spectral data. Hydrazones have been studied by liquid-liquid extraction towards the s-metal ions (Li(+), Na(+), and K(+)) and d-metal ions (Cu(2+) and Cr(3+)) from aqueo...

The title compound, C(23)H(20)N(4)O, is a heterocyclic phenyl-hydrazone Schiff base with a pyrazole moiety. In the crystal, a variety of inter-actions occur, including N-H⋯π and π-π stacking between the phenyl ring of the phenyl-hydrazinyl group and its symmetry-generated equivalent [centroid-centroid distance = 3.6512 (7) Å].

Complexes of arylidene salicyloyland benzoyl-hydrazones with the 3d metal ions, C r(III), M n(II), F e (III), C o (II), N i(II) and C u (II), have been prepared using 2:1 ligand to metal ion ratio. Characterization of the isolated solids was accomplished by IR and electronic spectra, elemental analysis, and molar conductivity measurements. It is concluded that the two Schiff bases function as n...

Substituted Schiff bases (hydrazones) 5a-j have been prepared from the starting material 2-chloro pyridine-3-carboxylic acid 1 by a sequence of reactions like reaction with 2-amino-6-nitro benzothiazole (Ullamann condensation), thionyl chloride, hydrazine hydrate and different aromatic aldehydes. On cyclocondensation of 5a-j with thioglycolic acid in dry 1,4-dioxane furnished desired compounds ...

Hydrazones derivatives of carbonyl compounds constitute an important class of biologically active compounds. Metal complexes of Schiff bases represent an important class of coordination compounds. Schiffs base containing hetero donar atom continue to provide the interesting facts in the fields of coordination chemistry. Literature studies on hydrazones have shown that these derivatives possess ...