Influence of cation, solvent and temperature on Z–E isomerisation of radical ion pairs derived from (Z)- and (E)-1,2-bis(2,4,6-trimethylbenzoyl)ethenes by chemical reduction with alkali metals and magnesium. A structural, electron paramagnetic resonance, ENDOR and TRIPLE resonance study

1993 ◽  
Vol 89 (9) ◽  
pp. 1327-1337 ◽  
Author(s):  
M. Celina R. L. R. Lazana ◽  
M. Luisa T. M. B. Franco ◽  
Bernardo J. Herold
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Alkali Metals ◽  
Chemical Reduction ◽  
Ion Pairs ◽  
Triple Resonance ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

The Electron Paramagnetic Resonance Spectrum of the Phenalane Anion

1972 ◽  
Vol 50 (10) ◽  
pp. 1523-1528 ◽  
Author(s):  
D. H. Paskovich ◽  
A. H. Reddoch
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectrum ◽  
Alkali Metals ◽  
Room Temperature ◽  
Resonance Spectrum ◽  
Ion Pairs ◽  
Coupling Constants ◽  
Paramagnetic Resonance ◽  
Conformational Interconversion ◽  
Electron Paramagnetic

The phenalane anion has been prepared by the reaction of alkali metals in ether solutions of both phenalane and phenalene. The electron paramagnetic resonance spectra of both the radical and of its ion pairs with sodium and with lithium in THF are reported. At room temperature there is an alternating linewidth involving the β protons caused by conformational interconversion of the axial and equatorial positions. At −80 °C the γ protons are not equivalent and the corresponding coupling constants are resolved.

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