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Stable Radicals of Naphthols

The radicals corresponding to binaphthols possess substantially greater stability. Thus, in the oxidation of binaphthol (VI) and its oxy-derivative (VII), stable radicals are formed, characterized by triplet EPR spectra (Fig. 37). The triplet arises on account of the strong interaction of the unpaired electron only with the two equivalent protons of the rings (splitting 2. 7 Oe) the remaining protons interact weakly with the electron. The radicals are stable and do not react with diphenylpicryl-hydrazyl at room temperature however, they disproportionate rapidly under the action of light. [Pg.50]

In the crystalline state, the radicals mainly recombine. The degree of their dissociation in the crystals is about 0.1% at room temperature. Upon solution, the degree of dissociation increases. The temperature dependence of the degree of reversible dissociation has been investigated [Pg.50]


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Of 1-naphthol

Radicals stable

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