- Crown-ether styryl dyes 15. Synthesis and two pathways of regio- and stereospecific cation-dependent -autophotocycloaddition of chromogenic 15-crown-5-ether betaines of quinoline series
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Styryl dyes (4a,b) containing a 15-crown-5 fragment and isomeric 2- and 4-quinolinium residues with an N-sulfopropyl substituent undergo -autophotocycloaddition to give cyclobutane derivatives (9a,b) in acetonitrile only in the presence of Mg(ClO4)2 or Ca(ClO4)2.The stereospecificity of both pathways of photocycloaddition and its efficiency are explained by the preorganization of the supramolecular dimers derived from the trans-isomers of the dyes when they are bound into complexes with Mg and Ca cations. - Keywords: crown ether styryl dyes; complex formation; -photocycloaddition; cyclobutane derivatives; 1H NMR spectra.
- Gromov, S. P.,Fedorova, O. A.,Ushakov, E. N.,Buevich, A. V.,Alfimov, M. V.
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- Dyeing method using a specific cationic derivative and a compound selected among a specific aldehyde, a specific ketone, a quinone and a di-imino-isoindoline or 3-amino-isoindolone derivative
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Compositions, methods, and kits for dyeing at least one keratin fiber, comprising at least one specific cationic compound and at least one compound chosen from specific aldehydes, specific ketones, quinones, diiminoisoindoline derivatives, and 3-aminoisoindolone derivatives, with the proviso that the inventive compositions do not comprise an oxidizing agent.
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- Microwave assisted sulfopropylation of N-heterocycles using 1,3-propane sultone
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Dramatic rate acceleration was observed for N-sulfopropylation of heterocyclic compounds (1a-h) using 1,3-propane sultone(2) under microwave irradiation affording the N-sulfopropylated compounds (3a-h) in 68-95% yield.
- Adamczyk, Maciej,Rege, Sushil
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p. 9587 - 9588
(2007/10/03)
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