Tetrahedron Letters

A novel ZrO 2–SO 4 2− supported palladium catalyst for syntheses of disubstituted ureas from amines by oxidative carbonylation

F Shi, Y Deng, T SiMa, H Yang

Index: Shi, Feng; Deng, Youquan; SiMa, Tianlong; Yang, Hongzhou Tetrahedron Letters, 2001 , vol. 42, # 11 p. 2161 - 2163

Full Text: HTML

Citation Number: 41

Abstract

The syntheses of disubstituted ureas by carbonylation of a series of amines in the presence of a sulfate modified zirconia supported palladium catalyst was investigated at an initial total pressure of 4.0 MPa and 135° C. High conversions and yields were achieved for the synthesis of symmetric dialkylureas. This supported catalyst could also be easily separated and recovered after reaction.