The 4-pyrazoline-3-one 1 reacts with 4-dimethylaminobenzaldehyde to yield the stable asymmetric cyanine dye 2b which reacts with 1 to give the colorless (aryl) (dipyrazolyl) methane 3b. Using aldehydes with less cationstabilizing groups the polymethines 2 are not isolated but only the methanes 3. The structures of 2b and 3 are discussed by1H,13C and Hetero NMR spectra.
|Translated title of the contribution||Synthesis and structure of pyrazolyl cations with polymethine and methane framework|
|Number of pages||7|
|Journal||Monatshefte für Chemie Chemical Monthly|
|State||Published - Feb 1 1983|
- Cyanine dyes