ether is c y c l k d to I-phenyl-1,2,4-triazol-5-one (4) (yield: 81 %). 1,2,4-Triazol-5-one results directly from (2) and hydrazine in 60 7; yieid. (31, Y = NH2 or (4). Y = OH 4CsNHNH> r -y T' I CSHS .s-Triazines are not only obtained from open-chain amidines; N-cc-pyridyl-N'-ethoxycarbonylformamidi
A macrocyclic bis-cyanine dye
β Scribed by I.L. Mushkalo; G.G. Dyadyusha; L.S. Turova; M.Yu. Kornilov
- Book ID
- 103406526
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- French
- Weight
- 312 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0040-4039
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π SIMILAR VOLUMES
Synthesis of new acidochromic-based dyes is presented. The dyes obtained have acid absorbance maxima at 640-700 nm and expose spectral changes in the pH-range from 8 to 12.
30 %' methanolic solution of I1 at room temperature and under a nitrogen atmosphere (PH always < 8-9). The solutions are allowed to stand overnight and are then diluted with water, acidified with dilute H2S04, ethered out, and the solvent evaporated o@. In addition to large quantities of ill-smelli
The reactivity of carboxonium salts permits substitution of UV/vis spectrophotometry. Furthermore, the X-ray structure of 1b has been determined and compared with that predicted one or both of the reactive terminal ethoxy groups by amidino moieties. In this way, new cyanine dyes with extended by mol