Mm. Mojtahedi et al., A novel method for the synthesis of disubstituted ureas and thioureas under microwave irradiaton, J CHEM R-S, (12), 1999, pp. 710-711
Several symmetrically disubstituted ureas and thioureas are synthesized by
heating of urea or thiourea with aromatic amines or phenylhydrazine under e
nvironmentally benign conditions without any solvent in a conventional micr
owave oven.