of step e with an organic solvent concentrating and adding non polar hydrocarbon solvent to obtain anastrozole of enhanced purity an improved process of the present invention uses non polar solvent for bromination selected from a group consisting of carbon tetrachloride and chlobenzene an improved process of the present invention uses brominating agent n halosuccinimide preferably n bromosuccinimide an improved process of the present invention uses radical initiator in the step of bromination selected from a group consisting of benzolyperoxide and aibn an improved process of the present invention uses optionally non polar solvent in combination with dmf preferably toluene or hexane solvent in the coupling reaction with alkali metal triazole an improved process of the present invention uses triazole salt selected from a group consisting of sodium triazole and potassium triazole an improved process of the present invention uses alkali carbonate selected from a group consisting of sodium carbonate and potassium carbonate an improved process of the present invention uses water immiscible solvent for extraction selected from a group consisting of toluene methylene chloride disopropyl ether and chloroform preferably toluene an improved process of the present invention uses organic acid selected from a group consisting of p toluene sulphonic acid malefic acid fumaric acid oxalic acid and mineral acid selected from hydrochloric acid phosphoric acid sulphonic acid and hydrobromic acid for the preparation of acid addition salt an improved process of the present invention uses aromatic solvent toluene optionally with polar solvent selected from a group consisting of methanol ethanol isoproponal acetonitrile and acetone for the preparation of acid addition salt the preparation of anastrozole is depicted in.