Synthesis of arylazothiazole dyes in the presence of sulfonated nanostructures

Montmorillonite-catalysed coupling reactions: a green overview

“…In another approach, studies were conducted by Safari et al on the synthesis of amino-aryl-azothiazole dyes via diazo coupling reaction using –SO 3 H-activated nanostructures as catalysts. 65 The group synthesized a new green, economical and heterogeneous catalyst by introducing –SO 3 H groups on MMT (montmorillonite) through covalent bonds. Here, aniline derivatives, sodium nitrite and 2-aminothiazole reacted in the presence of 0.2 g –SO 3 H-activated catalyst in ethanol.…”