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

Autor:	K. Hannonen, E. Salo, S. Kasa, Heikki Joela, Reijo Mäkelä
Rok vydání:	1990
Předmět:	Semiquinone Hydroquinone Stereochemistry Radical Inorganic chemistry General Chemistry Alkali metal law.invention 1 4-Benzoquinone chemistry.chemical_compound chemistry law Kinetic isotope effect General Materials Science Methanol Electron paramagnetic resonance
Zdroj:	Magnetic Resonance in Chemistry. 28:261-267
ISSN:	1097-458X 0749-1581
DOI:	10.1002/mrc.1260280313
Popis:	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.
Databáze:	OpenAIRE
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