Polymer-Immobilized Gold Catalysts for the Efficient and Clean Syntheses of Carbamates and Symmetric Ureas by Oxidative Carbonylation of Aniline and Its Derivatives

A series of highly efficient polymer-immobilized gold catalysts were prepared for the oxidative carbonylation of aniline and its derivatives to obtain carbamates and symmetric ureas in a clean, simple, solvent-free, and obtainable product-ready way. TEM showed that the average gold particle size of fresh catalyst was less than 10 nm.