Non classical methods (water based reaction, microwave and grindstone chemistry) were used for the preparation of Schiff bases from 3‐chloro‐4‐fluoro aniline and several benzaldehydes. The key raw materials were allowed to react in water, under microwave irradiation and grindstone. These methodologies constitute an energy‐efficient and environmentally benign greener chemistry version of the classical condensation reactions for Schiff bases formation.
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Naqvi et al. (2009) studied this question.