Collect. Czech. Chem. Commun.
1989, 54, 196-199
https://doi.org/10.1135/cccc19890196
Photochemical synthesis of 4-ethoxycarbonyl-5-hydroxypyrazoles
Maria K. Spassova and Rossitza D. Zakharieva
Institute of Molecular Biology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Abstract
The photochemical decomposition of 4-ethoxycarbonyl-5-diazopyrazoles in tetrafluoroboric acid results in corresponding 4-ethoxycarbonyl-5-hydroxypyrazoles (V-VII). The irradiation of the diazocompound in dioxane, toluene or tetrahydrofurane proceeds with a reductive decomposition producing corresponding 4-ethoxycarbonylpyrazole (VIII) as the main photoproduct.
