LAUSR

Fluorinated dialkyl carbonates, which serve as environmentally benign phosgene substitutes, were successfully produced from carbon dioxide either directly or indirectly. Nucleophilic addition of 2,2,2-trifluoroethanol to carbon dioxide and subsequent reaction with 2,2,2-trifluoroethyltriflate ( E OTf ) afforded bis (2,2,2-trifluoroethyl) carbonate ( 1 ) in up to 79%. Additionally, carbonate 1 was obtained by the stoichiometric reaction of E OTf and cesium carbonate. Although bis (1,1,1,3,3,3-hexafluoro-2-propyl) carbonate ( 3 ) was difficult to be obtained by either of the above two methods, it could be synthesized by the transesterification of carbonate 1 .