Fluorescent quinolizinium ionic liquids (salts) with unexpectedly high quantum yields up to >99%
Quinolizinium ionic liquids (salts) featuring an unbranched cation core have been prepared, characterized and found to show extremely high fluorescence quantum yields in solution (Φf > 99%, λem near 334 nm) and bright cyan fluorescence in molten state (λem near 465 nm).
(Equation presented) A library of cycloimonium salts has been prepared through Westphal reaction in solid-phase. By reaction of solid-support-bound azolium or azinium acetates 2, 1,2-diketones 4, and base, cycloimonium salts 5 were synthesized in good to high yield and purities.
Delgado, Francisca,Linares, M. Lourdes,Alajarin, Ramon,Vaquero, Juan J.,Alvarez-Builla, Julio
p. 4057 - 4060
(2007/10/03)
2-Methylpyridinium Salts as 1,4-Dinucleophiles. Quinolizinium Salts from the Westphal Condensation
Condensation of 2-methylpyridinium salts with 1,2-dicarbonyls in the presence of base, yielded 2,3-disubstituted quinolizinium compounds.Results obtained with different pyridinium substrates are discussed.
Alvarez-Builla, J.,Trigo, G. Gonzales,Ezquerra, J.,Fombella, M.E.
p. 681 - 685
(2007/10/02)
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