This   literature   review   concerned   with  antipyrine  compound . Antipyrine compound   is  very  important  compound  in  many  chemistry  fields  such   as  in  coordination chemistry , analytical chemistry  as a reagent   which   continuously   identified  for possible   uses  and   applications in  several  fields   beside  to  pharmacological  , medical   and  industrial  fields.

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INTRODUCTIONThe heterogeneous azo ligands are newly bonded, compared to their previous ligands of ring homogeneous. The importance of its features is the inclusion of one of its rings association with the azo group or both [1,2] on one atom and at least in its annular structure, which can be in coordination with the metal ions.The heterogeneous ligands of the nitrogen containing nitrogen ring are more common than other ligands containing oxygen atoms in their chemical composition [3]. The imidazole belongs to a class of compound called the azolates, which were prepared by Debus [4]. The imidazole is similar to pyrimidine in its chemical composition, both of which contain heterogeneous nitrogen atoms in their heterogeneous ring [5]. The nitrogen atom of the azole has free pair of electron and does not share to fixation of imidazole, caused the basicity of this ring and is easy to bond with the metal ions [6].The imidazole molecule is a stronger base than pyridine and it possesses the two resonance formulas. The electron density calculations showed that the electrophilic attack must occur at the two positions of this molecule. The azo ligands derived from this molecule or its derivatives have proved this fact [7]. EXPERIMENTALAll the chemicals used in this work were of highest purity available and were purchased from commercial sources (BDH 3-((E)-1-(2-phenylhydrazono) In this paper, a new azo ligand, 4,5-dimethyl-2-((3-((E)-1-(2-phenylhydrazono)ethyl)phenyl)diazenyl)-1H-imidazole (DPDPIH) and its metal complexes were synthesized. The ligand (DPDPIH) and its metal complexes were characterized by elemental, IR, 1 H NMR electronic and mass spectra. The values of elemental microanalysis and metal contents were in good agreement with the calculated values. The molar conductivity indicated that all these metal complexes were non-electrolyte in nature. The magnetic susceptibility values indicated that all the metal complexes were paramagnetic except cadmium and zinc complexes. Synthesis and Characterization of New Azo 4,5-dimethyl-2-((