Poly-(N,N′-dibromo-N-ethyl-benzene-1,3-disulfonamide) and N,N,N′,N′- Tetrabromobenzene-1,3-disulfonamide as Highly Efficient Catalysts, and (AC2O/SIO2) as a Heterogeneous System for the Acetylation of Alcohols, Amines, and Thiols Under Microwave Irradiation

Poly-(N,N′-dibromo-N-ethyl-benzene-1,3-disulfonamide) (PBBS) and N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide (TBBDA) are good activators and catalytic reagents for the acetylation of alcohols, amines, and thiols. The presented method has the advantages of mild conditions, chemoselectivity, and good to high yields, and uses noncorrosive, inexpensive, recyclable, and environmentally friendly catalysts. We have also demonstrated that combining SiO2 with microwave energy provides an efficient, fast, convenient, and easy workup procedure for the synthesis of mono- and disubstituted acetates, acetamides, and thioacetamides.