| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | 5-acetylamino-4-(4-chlorophenylazo)-3-methylpyrazole | 1391867-02-9 | C12H12ClN5O | 277.713 |
| —— | 5-amino-4(4-chlorophenylazo)-1-(2-cyanoethyl)-3-methylpyrazole | 1391867-01-8 | C13H13ClN6 | 288.739 |
| —— | 1-benzoyl-3-(5-methyl-4-(4-chlorophenylazo)-2H-pyrazol-3-yl)thiourea | 1391867-03-0 | C18H15ClN6OS | 398.876 |
Three series of 3,7-bis(arylazo)-2,6-dimethyl-1 H-imidazo[1,2- b]pyrazoles were prepared starting from N-aryl-2-oxo-propanehydrazonoyl chlorides. The acid dissociation constants p Ka were determined and correlated with the Hammett equation. The results of such correlations together with the spectroscopic data indicated that the title compounds exist predominantly in the 1 H-bis(arylazo) form.