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GRAPHICAL ABSTRACT
Abstract
Nano-titania-supported sulfonic acid (n-TSA) has been used as an efficient, inexpensive and reusable heterogeneous nano catalyst for synthesis of 2-arylbenzothiazole derivatives under solvent free condition. The reaction works very well, with good to excellent yields, for different aromatic aldehydes with both electron-withdrawing and electron-donating groups. Easy preparation and separation of catalyst, simply workup procedure, clean reaction, and reusability of the catalyst up to seven times without appreciable loss of its catalytic activity are undoubtful advantages of this work.