Anil-Synthese. 3. Mitteilung [1] Über die Darstellung von Styryl-Derivaten aus methyl-substituierten carbocyclischen Aromaten
作者:A. E. Siegrist、P. Liechti、H. R. Meyer、K. Weber
DOI:10.1002/hlca.19690520836
日期:——
1,4-Diphenylbutadien-, Tolan-, 1,4-Diphenylbutadiin-, Naphtalin-, Anthracen-und Phenanthren-Reihe werden mit Anilen aromatischer Aldehyde in Dimethylformamid in Gegenwart von Kaliumhydroxid oder Kalium-t-butylat zu Styryl-Derivaten umgesetzt.
甲基取代碳环芳烃,二苯基,三联苯,Stilben-,1,4-二苯基丁二烯-,Tolan-,1,4-二苯基丁二烯-,萘酚-,蒽环与苯并蒽-苯并二氮杂-苯并二氢萘Gegenwart von Kaliumhydroxid oder Kal-叔丁基中的二甲基甲酰胺。
Features of the Quantum Chain Process in the Photochemical One-Way Isomerization of 2-Anthrylethylenes
Regarding 2-anthrylethylenes which undergo a photochemical cis-to-trans one-wayisomerization, their preparative methods are presented. The isomerization of ArCH=CHPh and ArCH=CH(2-naphthyl) (Ar: 2-anthryl) proceeds through a quantum chain process slightly more efficiently than ArCH=CHtBu. The origin of the high efficiency in the quantum chain process of these ethylenes is discussed.
Temperature and solvent effects on rotamer-specific photobehaviour of the cis and trans isomers of 2-styrylanthracene
作者:Anna Spalletti、Giampiero Bartocci
DOI:10.1039/a906176b
日期:——
The photochemical and photophysical behaviour of the two stereoisomers of 2-styrylanthracene (2-StAn) has been investigated as a function of temperature and solvent polarity. The photobehaviour of both the trans and cis isomers markedly depends on the 1Lb or 1(La–Bu) nature of the two lowest singlet excited states and on their energy gap. Furthermore, the deactivation channels of the excited states are markedly dependent on conformer geometry, which produces rotamer-specific photoreactive pathways. The excited state properties were investigated by stationary and pulsed fluorimetric techniques and by laser flash photolysis. This paper reports the photophysical and photochemical parameters of the different conformational geometries (rotamers) of trans-2-StAn and cis-2-StAn. The role played by an upper excited singlet state (S2) of the long-lived B rotamer of trans-2-StAn on the relaxation properties (radiative and reactive) of its S1 state is also discussed. The new and relevant experimental and calculation results, reported in this paper, allow a complete and revised picture of the conformational equilibria and the radiative and radiationless relaxation rate parameters of the two geometrical isomers of 2-StAn to be obtained.
Temperature Dependence of the Photoisomerization of <i>cis</i>-1-(2-Anthryl)-2-phenylethene. Conformer-Specificity, Torsional Energetics and Mechanism
作者:Jack Saltiel、Yuxin Zhang、Donald F. Sears
DOI:10.1021/ja972293a
日期:1997.11.1
of adiabatic formation of 1t-APEB* remains remarkably temperature independent at 50.5 ± 0.7%. These results, together with photoisomerization quantum yields as a function of [c-APE] in degassed and air-saturated toluene, reveal a detailed photoisomerization mechanism. At infinite dilution and in the absence of molecular oxygen, photoisomerization of c-APE occurs predominantly via the adiabatic, conformer-specific
We synthesized three asymmetric anthracene derivatives, in which 2-phvA shows a high field-effect mobility of 10 cm2 V−1 s−1. This work demonstrates the potential advantages of asymmetric structures for high-performance organic semiconductors.