6271-27-8Relevant academic research and scientific papers
Visible-light photocatalyzed oxidative decarboxylation of oxamic acids: a green route to urethanes and ureas
Pawar, Govind Goroba,Robert, Frédéric,Grau, Etienne,Cramail, Henri,Landais, Yannick
supporting information, p. 9337 - 9340 (2018/08/31)
A sustainable metal-free route to urethanes and ureas based on a photocatalyzed oxidative decarboxylation of oxamic acids is described. The reaction includes in situ generation of an isocyanate from the oxamic acid, using an organic dye as a photocatalyst, a hypervalent iodine reagent as an oxidant and a light source, which trigger the free-radical decarboxylation. This protocol successfully avoids the isolation, purification and storage of carcinogenic isocyanates and allows elaboration of urethanes and ureas in a one-pot process from commercially available sources.
Method for Preparing Dicarbamate Compounds
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Paragraph 0032-0033; 0056-0057; 0067-0070, (2017/01/02)
The present invention provides a preparing method of dicarbamate, comprising: a first step of obtaining an alcohol solution including diureido obtained by reacting diamine having 2 to 13 carbon atoms with urea in the presence of alcohol having 3 to 12 carbon atoms at low temperature of 150anddeg;C or less; and a second step of obtaining dicarbamate by reacting the alcohol solution including the diureido at high temperature of 200anddeg;C or more under carbon dioxide pressure. According to the preparing method of the present invention, yield and selectivity of dicarbamate are significantly increased, and formation of an alkylated amine by-product can be minimized.COPYRIGHT KIPO 2016
