RESUMO
Naphthols were selectively coupled under sonication using Fe(+3) impregnated pillared Montmorillonite K10 and TBHP as an oxidant. Considerable enhancement in the reaction rate was observed under sonication as compared to the reaction performed under silent condition. The activity of catalyst was compared with other Fe clay catalysts. Various parameters like solvent, catalyst and TBHP concentration has been studied. The heterogeneous active catalyst K10-FePLS120 was recycled without loss in activity and selectivity performance.
Assuntos
Bentonita/química , Ferro/química , Naftalenos/química , Naftalenos/síntese química , Oxidantes/química , terc-Butil Hidroperóxido/química , Catálise , Química/métodos , Cromatografia Líquida de Alta Pressão/métodos , Modelos Químicos , Solventes/química , Fatores de Tempo , Difração de Raios XRESUMO
Phenols are selectively nitrated to o-nitrophenol along with rate enhancement using dilute nitric acid (6 wt%)/tetra butyl ammonium bromide (TBAB) under sonication. The selectivity can also be reversed to p-nitrophenol using NaBr as a catalyst. Kinetic analysis of nitration of phenol both with and without sonication has been investigated by variation of reaction parameters such as catalyst, nitric acid and substrate concentration.
