title: Hexaalkylguanidinium and 2-(dialkylamino)-1,3-dimethylimidazolinium trimethyldifluorosiliconates and perfluoroalkoxides. Accidental isolation and molecular structure of [C(NMe2)3]+F-*6CH2Cl2.
abstract: Hexaalkylguanidinium and 2-(dialkylamino)-1,3-dimethylimidazolinium trimethyldifluorosiliconates, precursors for two stable hexaalkylguanidinium perfluoroalkoxides, were synthesized by treating commercially available bis(dialkylamino)difluoromethane derivatives with (dialkylamino)trimethylsilanes in aprotic media. With hexamethylguanidinium pentafluoroethoxide the introduction of the lipophilic and electronegative C2F5O group was straightforwardly achieved in the case of primary and secondary alkyl triflates to furnish the respective fluorinated ethers. The molecular structures of [(CH2NMe)2C(NEt2)]+[Me3SiF2]- and [C(NMe2)3]+F-*6CH2Cl2 were determined, showing in the latter case a fluoride anion octahedrally coordinated by six methylene chloride molecules via hydrogen bridges with a F...H distance of 205 pm (C...F distance 270.0(3) pm).
authors.affiliation: Institute of Organic Chemistry, Ukrainian National Academy of Sciences, Murmanskaya 6, 02094 Kiev, Ukraine. alex@ chemie.uni-bremen.de
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Kolomeitsev
authors.forename: German
authors.initials: G
authors.lastname: Bissky
authors.forename: Jan
authors.initials: J
authors.lastname: Barten
authors.forename: Natalya
authors.initials: N
authors.lastname: Kalinovich
authors.forename: Enno
authors.initials: E
authors.lastname: Lork
authors.forename: Gerd-Volker
authors.initials: GV
authors.lastname: Röschenthaler