Structures and photochromic properties of substituted spiroindolinonaphthoxazines
β Scribed by S. M. Aldoshin; I. I. Chuev; O. S. Filipenko; A. N. Utenyshev; V. Lokshin; P. Laregenie; A. Samat; R. Guglielmetti
- Publisher
- Springer
- Year
- 1998
- Tongue
- English
- Weight
- 666 KB
- Volume
- 47
- Category
- Article
- ISSN
- 1573-9171
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## Abstract ^1^H and ^13^C studies of a series of 19 photochromic spiroindolinonaphthoxazines were carried out by twoβdimensional NMR methods. The assignments of the ^1^H resonances were made by 2D homonuclear shift correlation (COSY) and the 2D nuclear Overhauser effect (NOESY). Complete ^13^C che
%bstract 2-Hydroxychalcones with 4'-amino substituents undergo facile photochemical conversion into highly coloured flavylium ions on irradiation ,vith 365--436 nm light in aqueous ethanol solution in the pH region 4-6. The coloured solutions are substantially stable against prolonged rradiation wit