508-08-7Relevant academic research and scientific papers
Photoreactions of Flavanones
Matsushima, Ryoka,Kishimoto, Tsuneo,Suzuki, Morio,Morioka, Motonobu,Mizuno, Hideo
, p. 2938 - 2942 (1980)
Parent and substituted flavanones undergo photochemical opening of the pyrone ring to give corresponding 2'-hydroxychalcones in benzene, acetonitrile etc., the yields varying from 0 to 70percent with substituents.The reaction is depressed by the addition of 1,3-pentadiene, nitrosobenzene, or acrylonitrile.On the other hand, flavanone and 4-chromanone undergo photoreduction in 2-propanol to give reductive coupling products and solvent adducts as isomeric mixtures. 7,8-Benzoflavanone does not undergo photoreduction in 2-propanol but the ring opening reaction instead.Mechanisms have been discussed in terms of the relative contribution of n,?* and ?,?* character in the lowest triplet states.
Specific Photoreactions of Flavanones Typical of n,?* and ?,?* Characters in Lowest Triplet States
Matsushima, Ryoka,Sakai, Katsuhisa
, p. 1217 - 1222 (2007/10/02)
On irradiation with u.v. light, flavanones undergo photochemical opening of the dihydropyranone ring (φ2 3 2, φ3, and γ with substituents are explicable in terms of relative contributions of n,?* and ?,?* character in lowest triplet states.
HYDRODIMERISATION ELECTROCHIMIQUE DE CETONES AROMATIQUES ENCOMBREES EN MILIEU APROTIQUE ET EN PRESENCE DE CHLORURE DE CHROME
Fournier, F.,Berthelot, J.,Pascal, Y. L.
, p. 339 - 347 (2007/10/02)
The electrochemical reduction of hindered aromatic ketones which are difficult to reduce alone, can be achieved in an aprotic medium (DMF) on a mercury pool cathode, in presence of Cr(III) chloride, at the reduction potential of the Cr(II)/Cr(0) system, but at a less negative potential than that of the ketone itself.There is a selective hydrodimerisation into an α-glycol, with total lack of polimerisation.With disymmetric ketones, the dl-diastereoisomers of the diols are produced.The effect of chromium is due either to the reduction of a Cr-ketone complex or to thereduction of the ketone by a film of colloidal chromium on the electrode surface.
