Recyclable Polymer Supported Formate (Psf) and Tin: A Novel Reagent System For The Transfer Hydrogenation of Azo Compounds To Hydrazo Compounds

摘要

A novel and efficient catalytic transfer hydrogenation (CTH) system for the reduction of both symmetrical and unsymmetrical azo compounds to respective hydrazo compounds by using recyclable polymer supported formate as hydrogen donor in the presence of low cost tin powder as catalyst at room temperature in methanol medium has been reported. Many other sensitive functional groups like -OH, -CH3, -OCH3, -OC2H5, -COOH and halogens are compatible with the present system. The present method is found to give the product in excellent yield (90-95%) without any need for chromatographic purification steps.