Electron Impact and Thermal Fragmentation of Aryl -Acetanilides Synthesis of a new chelating resin bearing amidoxime group for adsorption of Cu(II), Ni(II) and Pb(II) by batch and fixed-bed column methods Removal of Pb (II), Cd (II), Mn (II), and Zn (II) using iminodiacetate chelating resin by batch and fixed-bed column methods ACID AZIDES. 3. NEW SYNTHESES OF BENZIMIDAZOLONES, PHTHALAZ-4-ONES AND BENZOXAZOLES INVOLVING BASE-CATALYZED CURTIUS REARRANGEMENT AND DISPLACEMENT OF ACID AZIDES