Electron-transfer activation in the thermal and photochemical osmylations of aromatic electron donor-acceptor complexes with osmium(VIII) tetroxide
作者:J. M. Wallis、Jay K. Kochi
DOI:10.1021/ja00232a039
日期:1988.11
La paire d'ions [Ar + , OsO 4 − ] est un intermediaire dans l'osmylation etudiee (Ar=benzene, naphtalene, anthracene, phenanthrene)
La paire d'ions [Ar + , OsO 4 − ] est un intermediaire dans l'osmylation etudiee(Ar=苯、萘、蒽、菲)
Regioselectivity in the Photocycloaddition of 9-Substituted Anthracenes Incorporated within Nafion Membranes
作者:Chen-Ho Tung、Jing-Qu Guan
DOI:10.1021/jo980412e
日期:1998.8.1
The photocycloaddition of five 9-substituted anthracenes [AnCH(2)N(+)(CH(3))(3)Br(-) (1), AnCH(2)COO(-)Na(+) (2), AnCH(2)OH (3), AnCOCH(3) (4), and AnCH(3) (5), An = 9-anthryl] incorporated within Nafion membranes has been investigated. While irradiation of the above compounds in homogeneous solutions, and 5 in Nafion also, mainly gave rise to their head-to-tail (h-t) photocyclomers, photoirradiation
The photocycloaddition of five 9-substituted anthracenes [AnCH2N+(CH3)3Br− (1), AnCH2COONa (2), AnCH2OH (3), AnCOCH3 (4), AnCH3 (5), An=9-anthryl] incorporated in water-in-oil microemulsions prepared from sodium bis(2-ethylhexyl) sulfosuccinate (AOT), methylene chloride and water has been investigated. While irradiation of the above substrates in methylene chloride, and 5 in the microemulsions also
Nanosized Particles of Organically Modified Silica as Microreactors to Enhance the Regioselectivity in the Photocycloaddition of 9-Substituted Anthracenes
have been prepared and successfully used as microreactors to control the regioselectivity of the photocycloaddition of five 9-substituted anthracences [AnCH(2)N(+)(CH(3))(3)Br(-) (1), AnCH(2)COO(-)Na(+) (2), AnCH(2)CH(2)COOH (3), AnCH(2)OH (4), AnCH(3) (5), where An = 9-anthryl]. While the photocycloaddition of the five substrates in methanol mainly gave rise to their head-to-tail (h-t) photocyclomers
作者:Nien-Chu C. Yang、John Masnovi、Wei-Long Chiang、Toyuan Wang、Hansen Shou、Ding-Djung H. Yang
DOI:10.1016/s0040-4020(01)92376-2
日期:——
photochemical cycloaddition reactions of anthracene, tetracene, benz(a)anthracene, dibenz(a,c)anthracene, dibenz(a,h)anthracene, dibenz(a,j)anthracene and pentaphene with 1,3-cyclohexadiene. The divergent reactivities of these arenes is not explicable in terms of Woodward-Hoffmann or derivative theories. We attribute the proclivities of these systems to engage in pericyclic cycloaddition reactions, and