Buu-Hoi et al., Journal of the Chemical Society, 1954, p. 1034,1037
作者:Buu-Hoi et al.
DOI:——
日期:——
Photooxygenation of 1,.omega.-Bis(diarylethenyl)alkanes via Photoinduced Electron-Transfer: Formation of 1,4-Radical Cations and Their Trapping by Molecular Dioxygen
The 9,10-dicyanoanthracene (DCA)-sensitized photooxygenation of 1,omega-bis(diarylethenyl)alkanes (Ar2C=CH(CH2)(n)CH=CAr2) was studied. The photooxygenation of the alkadienes in acetonitrile afforded bicyclic peroxides when Ar = 4-CH3OC6H4, n = 3 and 4. When Ar = 4-CH3OC6H4, n = 2, 5, 8 or Ar = C6H5, n = 3, the photooxygenation did not afford bicyclic peroxides, but gave diaryl ketones. Laser flash photolysis studies indicated that the photooxygenation is initiated by a one-electron transfer from the alkadienes to (1)DCA* and proceeds via 1,4-radical cations that are generated by an intramolecular cyclization between an ethenyl moiety and a radical cation of another ethenyl moiety.
Palladium-catalyzed stereoselective synthesis of E- and Z-1,1-diaryl or triarylolefins
various E- and Z-1,1-diaryl and triarylolefins 3 was achieved from readily available vinylstannanes 1 via stereospecific iodo-destannylation and subsequent palladium-catalyzed Negishi-type cross-coupling reaction with arylzincreagentsundermildconditions.
The 9,10-dicyanoanthracene (DCA)-sensitized photooxygenation of Ar2C=CH(CH2)nCH=CAr2 in acetonitrile was studied. When Ar = 4-CH3OC6H4, n = 3 and 4, bicyclic peroxides were obtained via 1,4-radical cations that are generated by intramolecular interaction between two ethenyl moieties of the alkadienes.
研究了乙腈中Ar 2 C = CH(CH 2)n CH = CAr 2的9,10-二氰基蒽(DCA)致敏的光氧合反应。当Ar = 4-CH 3 OC 6 H 4,n = 3和4时,经由1,4-自由基阳离子获得双环过氧化物,所述1,4-自由基阳离子是由链二烯的两个乙烯基部分之间的分子内相互作用产生的。