A new route of CO₂ catalytic activation: syntheses of N-substituted carbamates from dialkyl carbonates and polyureas
2012
Shang, Jianpeng | Liu, Shimin | Ma, Xiangyuan | Lu, Liujin | Deng, Youquan
This paper reports an effective route for the syntheses of N-substituted dicarbamates from dialkyl carbonates and polyurea derivatives, in which polyurea derivatives could be successfully synthesized from aliphatic diamines and CO₂ in the absence of any catalyst. Under the optimized reaction conditions, various N-substituted carbamates were successfully synthesized with 93–98% isolated yields over a MgO–ZnO catalyst. The catalyst could be reused for several runs without deactivation. The catalysts were characterized with X-ray photoelectron spectroscopy, X-ray diffraction and temperature-programmed desorption.
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