A. Mori, Zhi-hong Li, H. Takeshita
Sep 1, 1989
Citations
0
Influential Citations
5
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
2-Aryl-2,3-dihydro-3,3-dimethyl-5,6-cycloheptapyrazolediones with an electron-releasing group at C-4 on the benzene ring showed a bathochromic shift in acid solution, whereas the 4-ethoxycarbonylphenyl derivative showed a negative halochromism; 484 nm in ethyl acetate, 517, 566, and 600(sh) nm in trifluoroacetic acid, and 455 nm in coned sulfuric acid.