Sulfated tungstate: A green catalyst for synthesis of thiomorpholides via Willgerodt-Kindler reaction

Use of sulfated tungstate as an efficient, green and reusable catalyst for preparation of thiomorpholides via Willgerodt-Kindler reaction pathway is presented. The reaction proceeds under solvent free condition. The advantages of this method are high yields, short reaction times, ease of product isolation and recyclability of catalyst for a number of times without significant loss of activity. (C) 2011 Elsevier B.V. All rights reserved.