Process for the preparation of fluoroalkyl (alkyl carbonates and carbamates

Abstract

Fluoroalkyl alkyl carbonates and fluorosubstituted carbamates which are suitable as additives or solvents in lithium ion batteries are prepared from fluoroalkyl fluoroformates and the respective alcohol or amine. Methanol is the preferred alcohol, dimethylamine and diethylamine are preferred amines. Fluoromethyl methyl carbonate is the preferred compound to be produced. Fluoroalkyl fluoroformates can be prepared from aldehydes and carbonyl fluoride.

What is claimed is: 
     
         1 . A fluoroalkyl (fluoro)alkyl carbonate of the general formula (I), FCHR—OC(O)—OR′, wherein
 R is a linear or branched alkyl with 1 to 5 carbon atoms; and 
 R′ is 2,2,2-trifluoroethyl. 
 
     
     
         2 . The fluoroalkyl (fluoro)alkyl carbonate according to  claim 1 , wherein the fluoroalkyl (fluoro)alkyl carbonate is (1-fluoroethyl)-(2,2,2-trifluoroethyl)carbonate or (fluoromethyl)-(2,2,2-trifluoroethyl)carbonate. 
     
     
         3 . The fluoroalkyl (fluoro)alkyl carbonate according to  claim 2 , wherein the fluoroalkyl (fluoro)alkyl carbonate is (1-fluoroethyl)-(2,2,2-trifluoroethyl)carbonate. 
     
     
         4 . The fluoroalkyl (fluoro)alkyl carbonate according to  claim 2 , wherein the fluoroalkyl (fluoro)alkyl carbonate is (fluoromethyl)-(2,2,2-trifluoroethyl)carbonate.