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Farat O.K.,Ukrainian State University of Chemical Technology | Farat O.K.,Moscow State University | Markov V.I.,Ukrainian State University of Chemical Technology | Varenichenko S.A.,Ukrainian State University of Chemical Technology | And 2 more authors.
Tetrahedron | Year: 2015

We found that 1,3- and isomeric 3,1-benzoxazin-4-ones react with the Vilsmeier reagent in vastly different ways. Thus, either 2H- or 4H-chromenes were obtained in good yields when 1,3-benzoxazin-4-ones were reacted at 75-80 °C, while the formylation of 3,1-benzoxazines at ambient temperature leads to acridine-9-one or 9-chloroacridine derivatives, depending on the amount of Vilsmeier reagent and the nature of substrate. © 2015 Elsevier Ltd. All rights reserved. Source

Smola S.,Av Bogatsky Physico Chemical Institute | Rusakova N.,Av Bogatsky Physico Chemical Institute | Korovin Yu.,Av Bogatsky Physico Chemical Institute
Journal of Coordination Chemistry | Year: 2011

New heteronuclear Ln(III)-Bi(III) complexes (Ln = Nd, Eu, Tb, Yb, Lu) with ethylenediamine-N,N,N′,N′-tetraacetic (H4edta), trans-1,2- cyclohexane-diamine-N,N,N′,N′-tetraacetic (H4cdta), diethylenetriamine-N,N,N′,N″,N″-pentaacetic (H 5dtpa), and triethylenetetraamine-N,N,N′,N″,N‴, N‴-hexaacetic (H6ttha) acids have been synthesized with a different synthetic approach. Bi(III) is a sensitizer of the 4f-luminescence in visible and near IR region. Emission spectra of Eu(III)-Bi(III) complexes were studied and the asymmetry of Eu(III) coordination environment was estimated, in good agreement with molecular models. The complexes synthesized by self-assembly are characterized by higher values of the 4f-luminescence quantum yield than other Ln(III)-Bi(III) complexes. © 2011 Taylor & Francis. Source

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