Abstract
In this study, the simple and rapid methods for the preparation of benzimidazole and benzothiazole by the condensation of o-phenylenediamine with the aromatic aldehyde in presence of the zinc sulphide nanoparticles derived from the waste stem of the Trigonella foenum-graecum. The catalyst was prepared by using the waste stem of the Trigonella foenum-graecum. Most of the reaction carried under the mild condition with very high excellent yield. The method is used for the aromatic, unsaturated and heteroaromatic aldehyde. The main advantage of this method is that it takes very short reaction time, solvent free reaction condition, reusable catalyst, milder reaction, easy workup and waste stem of the plant was used.
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