The detection of the precursors of the photorearranged products of 3-hydroxyflavones in selected solvents from UV-visible spectra in situ

Abstract

2,3-Epoxy-2-hydroxy-1-indanone (epoxide) has been detected as a primary photoproduct in the photolysis of 3-hydroxy-2-phenyl-4H-chromen-4-one (3HF).

Photochemical synthesis and ring–chain–ring tautomerism of benzo[4,5]imidazo[1,2-a]cyclopenta[e]pyridines

“…12 Other examples of subsequent transformations of related intermediates generated by ESIPT have been reported in the literature. [13][14][15][16] It should be noted that ESIPT-induced reactions of 3-hydroxypyran-4-one derivatives are of considerable interest. In this case, contraction of the pyranone ring proceeds under UV irradiation leading to the formation of unstable α-hydroxy-1,2diketones.…”

“…12 Other examples of subsequent transformations of related intermediates generated by ESIPT have been reported in the literature. 13–16…”

A microchemical analysis of acid values in stored wheat

“…In comparison, although the UV-vis spectra are rarely used for AV determination, this technology is more secure because the analysis wavelength is located in the visible spectral region and the interference is small (Tomar et al, 2019). And the linear relationship is easier to establish if indicator material is suitable (Li et al, 2018(Li et al, , 2019.…”