Greener approach for the synthesis of substituted alkenes by direct coupling of alcohols with styrenes using recyclable Bronsted acidic [NMP] + HSO 4 − ionic liquid

A novel protocol for the synthesis of substituted alkenes from alcohols and styrenes using ionic liquid has been developed. The ionic liquid N -methyl-2-pyrrolidone hydrogen sulfate [NMP] + HSO 4 − acts as a catalyst as well as solvent. The developed protocol has higher atom efficiency and wider substrate applicability. The catalyst was effectively recycled for up to five consecutive cycles.