Pentakis(trifluoromethyl)phenyl, a sterically crowded and electron-withdrawing group: Synthesis and acidity of pentakis(trifluoromethyl)benzene, -toluene, -phenol, and -aniline

摘要

A general route to functionalized pentakis(trifluoromethyl)phenyl (C-6(CF3)(5)) derivatives, promising building blocks for designing novel stable carbenes, radical species, superacids, weakly coordinating anions and other practically and theoretically useful species, is presented. This pertrifluoromethylation route proceeds via conveniently pregenerated (trifluoromethyl)copper (CF3CU) species in DMF, stabilized by addition of 1,3-dimethyl-2-imidazolidinone (DMI). These species react with hexaiodobenzene at ambient temperature to give the potassium pentakis(trifluoromethyl)phenoxide along with hexakis(trifluoromethyl)benzene and pentakis(trifluoromethyl)benzene in a combined yield of 80%. A possible reaction pathway explaining the formation of pentakis(trifluoromethyl)phenoxide is proposed. Pentakis(trifluoromethyl)phenol gives rise to easily functionalized pentakis(trifluoromethyl)chlorobenzene and pentakis(trifluoromethyl)aniline. Pertrifluoromethylation of pentaiodochlorobenzene and pentaiodotoluene allows straightforward access to pentakis(trifluoromethyl)chlorobenzene and pentakis(trifluoromethyl)toluene, respectively. XRD structures of several C-6(CF3)(5) derivatives were determined and compared with the calculated structures. Due to the steric crowding the aromatic rings in all C-6(CF3)(5) derivatives are significantly distorted. The gas-phase acidities (Delta G(acid)) and pK(a) values in different solvents (acetonitrile (AN), DMSO, water) for the title compounds and a number of related compounds have been measured. The origin of the acidifying effect of the C-6(CF3)(5) group has been explored using the isodesmic reactions approach.