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Comparison of the Basic Strength of Solid Catalysts in the Synthesis of 2-Styrylbenzoxazoles under Microwave, Ultrasonic Irradiations and Solvent Free Conditions

“…The zeolites are used in many reactions such as Knoevenagel reactions 20 , condensations 21 and Henry reactions 22 . Alkali amides present excellent bases in organic synthesis and Alkali amides supported on alumina have led to the emergence of very effective solid base catalysts that have been used in many reactions such as alken isomeration [23][24] , vinyl byciclohepten isomerization 24 and Dimerization…”