Hexaalkylguanidinium Trifluoromethanesulfonates – A General Synthesis from Tetraalkylureas and Triflic Anhydride, and Properties as Ionic Liquids
作者:Helene Kunkel、Gerhard Maas
DOI:10.1002/ejoc.200700303
日期:2007.8
More than thirty hexaalkylguanidinium trifluoromethanesulfonates 12 were prepared from N,N-diethyl-N′,N′-dimethylurea, N,N-dibutyl-N′,N′-diethylurea, or tetrabutylurea, triflicanhydride, and a dialkylamine or cyclic sec-amine in two steps. The combination of the urea and triflicanhydride first yields a bis(tetraalkylamidinio)ether bis(triflate) 10, which is then converted into a salt 12 by reaction