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ESR, ENDOR and TRIPLE resonance studies on radical reactions of 1,4-benzoquinone and 1,4-hydroquinone in alkaline methanol and liquid ammonia

✍ Scribed by H. Joela; S. Kasa; R. Mäkelä; E. Salo; K. Hannonen

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
502 KB
Volume
28
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The relative signs and absolute values of the hyperfine coupling constants of different methoxy‐1,4‐benzoquinones were measured by ESR, ENDOR and TRIPLE resonance spectroscopy. Reactions of 1,4‐benzoquinone and 1,4‐hydroquinone with methanol took place in alkaline methanol, giving rise to methoxy‐substituted 1,4‐benzoquinones. The same substitution reaction occurred in a mixture of ammonia and methanol. The reactions depended on temperature and the alkali concentration. Coupling constants were assigned by the modified additivity relationship method. An extremely small line width of 0.014 G was measured in the ESR spectrum of deuterated 2,5‐dimethoxy‐1,4‐benzoquinone.

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