Efficient copper-promoted urethane formation from carbon dioxide, amines, and alkyl halides is described; an intermediate copper(I) carbamato-complex has been isolated and characterized.
T. Tsuda, H. Washita, K. Watanabe, M. Miwa and T. Saegusa, J. Chem. Soc., Chem. Commun., 1978, 815 DOI: 10.1039/C39780000815
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