Abstract

When the HClO4 and KHSO4 were adsorbed on to the surface of silica gel grains, they will get high thermal and mechanical
stabilities and these materials have been explored as a green catalyst for the thiocyanation reactions of aromatic, heteroaromatic
compounds under conventional condition, and ultrasonically assisted conditions. In the ultrasonically assisted protocol,
remarkable rate accelerations were exhibited and it offered selectivity in thiocyanation of aromatic compounds and heteroaromatic
compounds with better yields. Moreover, these catalysts could be recycled using simple procedure up to five cycles with good
catalytic efficiency. These developed protocols are also promising and comparable with the literature procedures.