Chiral Recognition in Disproportionation of Monoradical Cation of Optically Active Bisviologen in an Aqueous Solution
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Optically active bisviologens, containing 1-(1-naphthyl)-, 1-phenyl-, and 1-cyclohexylethylamine, were synthesized. Disproportionation of monoradical trications produced by one-electron reduction occurred more easily in the (<I>S</I>,<I>R</I>)-isomers than in the (<I>S</I>,<I>S</I>)- and (<I>R</I>,<I>R</I>)-ones. The disproportionation is controlled by steric bulk of the chiral substituents in <I>intra</I>molecular association between two viologen radical units of diradical dications.
- Chemistry Letters
Chemistry Letters 1997(9), 941-942, 1997-09
The Chemical Society of Japan