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Different benzopyran and 3-substituted coumarin derivatives were synthesized by a green and practical procedure in the presence of catalytic amount of Bronsted acid ionic liquid (BAIL) [(CH 2 ) 4 SO 3 HMIM][HSO 4 ] in water. KEY WORDS : Benzopyran derivatives, 3-Substituted coumarin derivatives, Bronsted acid ionic liquid, 1-(4-Sulfonic acid)butyl-3-methylimidazolium hydrogen sulfate Bull. Chem. Soc. Ethiop. 2011 , 25(2), 315-320.

bulletin of the chemical society of ethiopia

&lt;b&gt;Green and practical synthesis of benzopyran and 3-sunstituted coumarin derivatives by Brønsted acid ionic liquid [(CH&lt;sub&gt;2&lt;/sub&gt;)&lt;sub&gt;4&lt;/sub&gt;SO&lt;sub&gt;3&lt;/sub&gt;HMIM][HSO&lt;sub&gt;4&lt;/sub&gt;]&lt;/b&gt;