Halogen-free process for the conversion of carbon dioxide to urethanes by homogeneous catalysis.
Carbon dioxide is converted to urethanes (carbamic acid derivatives) through reaction with amine and alcohol catalyzed by tin complexes; th addition of acetals as a dehydrating agent under high CO2 pressure is the key to achieve high yields.
Abla
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National Institute of Advanced Indutrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
Chol
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JC
Sakakura
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