Synthese et reactivite de nouveaux synthons perfluoroalkyles. comportement atypique des azirines et aziridines F-alkylees.
摘要:
F-alkyl chains perturb the reactivity of substrates in an often unpredictable way. F-alkyl azirine and aziridine carboxylates were prepared from F-alkynylesters, in 80 and 60% yield, respectively, and were found to display reactivities different from those of their hydrocarbon analogs. Thus, F-alkylazirines (5) give addition products easily but resist ring opening, while the F-alkylaziridines (8) are extremely stable, both towards nucleophilic and electrophilic reagents and irrespective of the medium used, neutral, acid or basic.
A series of fluoroalkylated 1,2,3-triazoles have been synthetised in significant yields through unexpected intramolecular cyclisations of vinyl azides bearing electron-withdrawing groups. The mechanism proposed in this study implies the participation of a catalytic amount of azide ions in the cyclisations of the vinyl azides to triazoles. The study includes the alkylation of these compounds with various
Synthese et reactivite de nouveaux synthons perfluoroalkyles. comportement atypique des azirines et aziridines F-alkylees.
作者:Mustapha Haddach、Raphaël Pastor、Jean G. Riess
DOI:10.1016/s0040-4020(01)81291-6
日期:1993.5
F-alkyl chains perturb the reactivity of substrates in an often unpredictable way. F-alkyl azirine and aziridine carboxylates were prepared from F-alkynylesters, in 80 and 60% yield, respectively, and were found to display reactivities different from those of their hydrocarbon analogs. Thus, F-alkylazirines (5) give addition products easily but resist ring opening, while the F-alkylaziridines (8) are extremely stable, both towards nucleophilic and electrophilic reagents and irrespective of the medium used, neutral, acid or basic.
Proton conductivity properties of acid doped fluoroalkylated 1,2,3-triazole
Novel proton conducting organic electrolyte containing fluoroalkylated 1,2,3-triazole was synthesized via intramolecular cyclisation of vinyl azides. FT-IR, elemental analysis and NMR methods were used for the characterization of the resulting organic molecule. Triazole containing sample was doped with triflic acid to obtain proton conducting organic electrolytes. Thermal stability of these materials was analyzed with thermogravimetric analysis (TGA) and the melting temperatures were measured by differential scanning calorimetry (DSC). The effect of acid content on the proton conductivity was investigated with impedance spectrometer and the maximum proton conductivity was measured as 10(-2) S/cm at 150 degrees C. (C) 2010 Elsevier B.V. All rights reserved.