Vilsmeier-Haack reagent: An efficient reagent for the transformation of substituted 1,3-naphthoxazines into xanthene-type dyesстатья
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Дата последнего поиска статьи во внешних источниках: 29 мая 2019 г.
Авторы:
Farat Oleg K.,
Ananyev Ivan V.,
Varenichenko Svetlana A.,
Tatarets Anatoliy L.,
Markov Victor I.
Аннотация:Derivatives of 1,3-naphthoxazines containing from five to seven-membered spiro ring - under Vilsmeier
-Haack reaction conditions are rearranged into novel xanthene-type compounds. All synthesized aminochromene derivatives fluoresce in organic solvents with extra large Stokes shifts (100-133 nm). It was found that compounds containing five-membered annulated aliphatic rings in methanol solution have
the best spectral characteristics. These compounds have moderate quantum yields of 28.36-28.94%, and
extra large Stokes shifts 106 and 115 nm.