723-98-8Relevant academic research and scientific papers
PHOTOCHEMICAL STUDIES WITH o-VINYL DIARYL ETHERS A NEW PHOTO-HETEROCYCLIZATION REACTION ?
Eberbach, Wolfgang,Hensle, Juergen
, p. 4773 - 4776 (2007/10/02)
On photoexcitation the o-vinyl diaryl ethers 10a-d are transformed into o-hydroxy stilbenes 11 which preferentially on direct irradiation are further converted affording the annulated phenanthrenes 12.
Photochemical Addition of Methanol to Stilbenes
Woning, Jan,Oudenampsen, Albert,Laarhoven, Wim H.
, p. 2147 - 2154 (2007/10/02)
The photochemical addition of methanol to the alkenic bond of stilbene (1) involves two competitive pathways: viz. either direct addition of methanol to the alkenic bond or insertion by methanol of a carbene (13), emerging from a 1,2-H shift in (1).From the observed effect of substituents and the wavelength on the rates of these processes, the rearrangement pathway was concluded to involve excited (1) in a vibrationally unrelaxed S1-state.The direct pathway might involve either a planar (??*) or a twisted excited S1-state of (1).The available experimental evidence precludes zwitterionic excited states from being involved in both pathways.The photochemical addition of methanol to the alkenic bond of 1,1-diphenylethene (3) follows a similar course.In this case a 1,2-Ph shift in excited (3) gives rise to carbene (13) and its insertion products.
