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★ A novel ZrO2–SO4 2− supported palladium catalyst for syntheses of disubstituted ureas from amines by oxidative carbonylation
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A novel ZrO2–SO4 2− supported palladium catalyst for syntheses of disubstituted ureas from amines by oxidative carbonylation |
石峰 / 邓友全 |
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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. ★★★★☆ F. Shi et al. : Tetrahedron Letters 42 (2001) 2161–2163. |