Transformation of 6'-aminosubstituted spironaphthoxazines induced by Pb(II) and Eu(III) cationsстатья
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Аннотация:The transformation of spiroindolinonaphth[2,1-b][1,4]oxazines (SNOs) conjugated with aza-15(18)crown-5(6) ether moieties or morpholine in the presence of Pb2+ or lanthanoid cations in MeCN solution was studied by UV-Vis, NMR and surface-enhanced resonance Raman scattering spectroscopy methods. The Pb2+ or EU3+ cations induce the formation of the betaine merocyanine form of SNO. When the merocyanine complexes are kept in the dark, the corresponding oxazole derivatives are formed irreversibly and regioselectively. Copyright (c) 2005 John Wiley & Sons, Ltd.