الفهرس 
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Abstract
Great Efforts have been directed towards the synthesis of condensed 1, 2, 4, triazolo heterocycles 1 as a result of their a major part of the candidate’s work deals with the synthesis od different types of this class of this class of compounds namely 1, 2, 4 triazolo 4, 3, a Pyridines and 1, 2, 4, triazolo 3, 4, b 1, 3 benzothiazoles it was relevant therefore to devote the introductory chapter - chapter 1 to review the synthesis and biological activities of condensed 1, 2, 4 triazolo 3, 4, z heterocycles. this review chapter is scheduled for publication in volume 49 of the advances in heterocyclic chemistry to be printed in april 1990.