Alumina as a Support and Catalyst for the Synthesis of Benzothiazoles in Solvent??free Condition

MF Ding, CP Chen, ST Lin

Index: Ding, Mei-Fang; Chen, Chia-Pei; Lin, Shaw-Tao Journal of the Chinese Chemical Society, 2013 , vol. 60, # 6 p. 645 - 649

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Abstract

Abstract Arylbenzothiazole (4) and benzothiazolylcoumarins (5) were prepared by the condensation of 2-aminothiophenol (1) and hydroxybenzaldehydes (2) and 3- ethoxycarbonylcoumarinnin (3), respectively, in solvent-free condition. Of the solid support used, γ-Al 2 O 3 demonstrated the best activity. A linear regression line obtained from correlation between relative formation rate and Hammett constants with slope of 0.653 ...

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