Biphenyl-2-ylethylenes react with (4-BrC6H4)3N˙+SbCl6– to give the radical cation of the electrocyclization product which initiates a protic catalysis to the related fluorenes or, in presence of 2,6-di-t-butylpyridine or water, lead stoicheiometrically to phenanthrenes; with photochemical oxidants only phenanthrenes or 9,10-dihydrophenanthrenes are obtained, with an efficiency related to the polarity
Duerr,H.; Scheppers,G., Justus Liebigs Annalen der Chemie, 1970, vol. 734, p. 141 - 154
作者:Duerr,H.、Scheppers,G.
DOI:——
日期:——
Photochemical studies with o-vinyl diaryl ethers a new photo-heterocyclization reaction ?
作者:Wolfgang Eberbach、Jürgen Hensle
DOI:10.1016/s0040-4039(00)74085-8
日期:1993.7
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.