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■ Chemistry of Coumarins — Synthesis of Some 3,4-Substituted Coumarins Using the HSAB Principle

Ibro Tabakovic,* Katmerka Tabakovic, Radoslav Grujic, Nenad Trinajstic, and Zlatko Meic

*Faculty of Technology, The Gjuro Pucar Stari University, 78000 banja Luka, Bosnia and Herzegovina, Serbia and Montenegro

Abstract

Novel heterocyclic systems (2, 3, and 4) have been obtained by reactions of the corresponding bidentate nucleophiles, e.g. 2-mercaptoaniline, 3-mercapto-1,2,4-triazole and 2-mercaptobenzimidazole respectively, with 4-chloro-3-nitrocoumarin (1).