Synthesis of 1,3-dithiane and 1,3-dithiolane derivatives by tungstate sulfuric acid: recyclable and green catalyst

An efficient, novel, and environmentally benign procedure for the thioacetalization of aliphatic and aromatic carbonyl compounds in the presence of catalytic amounts of tungstate sulfuric acid under solvent-free conditions to afford 1,3-dithianes and 1,3-dithiolanes was reported. This method has many advantages including excellent yields, short reaction time, and simple work-up procedure. [GRAPHICS] .