Abstract
A convenient procedure for the synthesis of bis-quaternary ammonium salts from long-chain alkyldimethylamines and epichlorohydrin is studied. An improved preparation of bis-quaternary ammonium salts from N,N-dimethyloctylamine, N,N-dimethyldodecylamine or N,N-dimethyloleylamine, their amine hydrochlorides, and epichlorohydrin can be achieved by carrying out the reaction in an aqueous micellar medium. The amine hydrochlorides are used as functional surfactants to produce the self-micellization and solubilization of reactants. The formation of micelles is a necessary condition for a successful quaternization. Comparison of the quaternization performance in ethanol, ethanol/water mixtures, and aqueous micellar medium leads to the conclusion that this micellar-improved synthesis enables easier and cheaper access to bis-quaternary ammonium salts by avoiding the formation of the mono-quaternary ammonium salts as intermediates, and by using water as solvent under mild reaction conditions. Mechanistic aspects of the quaternization reaction in micellized medium are also suggested.
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Abbreviations
- b.p.:
-
boiling point
- HPLC:
-
high-performance liquid chromatography
- m.p.:
-
melting point
- NMR:
-
nuclear magnetic resonance
- UV:
-
ultraviolet
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Ricci, C.G., Cabrera, M.I., Luna, J.A. et al. Micellar-improved synthesis of bis-quaternary ammonium salts by the epichlorohydrin route. J Surfact Deterg 6, 231–237 (2003). https://doi.org/10.1007/s11743-003-0266-1
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DOI: https://doi.org/10.1007/s11743-003-0266-1