22782-70-3Relevant academic research and scientific papers
A new type of photodimerization reaction for coumarin derivatives
Kawata, Hiroki,Ichikawa, Satoko,Kumagai, Tsutomu,Niizuma, Shigeya
, p. 5161 - 5163 (2002)
Irradiation (λ >300 nm) of coumarin-3-carboxylic acid gives the decarboxylated 4,4′-dimer of chroman-2-one, the structure of which is quite different from that of [π2s+π2s] cycloaddition dimer as is observed in the past in the photoreaction of coumarin or some of its derivatives.
Studies on the Occurrence of Hydrogen Transfer, 76. The Anomal Course of the Electroreduction of Coumarine with Supporting Electrolyts Containing Li(+). Experiments to Influence the Reaction by Mediators
Horner, Leopold,Franz, Christoph
, p. 822 - 825 (2007/10/02)
In contradiction to the experience the hydrodimer is formed as the main product in the electroreduction of coumarine using lithium compounds as a supporting electrolyt.It is assumed that the lithium ions are coordinated internally with the radicalanion A resp.B derived from coumarine.In this way the hydrodimerization is favoured.From 18 different compounds added as possible mediators to the catholyt only pyridine influences moderately the ratio: hydrodimerization product/dihydroproduct. - Keywords: Hydrogen Transfer, Coumarine, Electroreduction
