Abstract

A novel non-phosgene process for the synthesis of methyl N-phenyl carbamate (MPC) by a reaction of phenylurea with methanol was studied. The reaction between phenylurea and methanol was found to be a spontaneous reaction that took place in the absence of catalyst and gave MPC as the main product. Addition of a catalyst markedly influenced the reaction behavior. A basic catalyst greatly enhanced the yield of MPC, whereas an acidic catalyst pro- moted the formation of aniline and methyl carbamate. Moderate strength of basicity showed the best catalytic per- formance in the cases studied. The mechanism of reaction and catalyst functioning was discussed.

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