N-oxides and related compounds. Part XXXI. The nuclear magnetic resonance spectra and tautomerism of some substituted benzofuroxans
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society B: Physical Organic
- p. 914-919
- https://doi.org/10.1039/j29670000914
Abstract
The tautomerism of eight benzofuroxans has been studied by proton magnetic resonance at low temperatures. The equilibrium constants implied small (0–500 cal./mole) energy differences, and indicated that electron-acceptor groups favoured the 6-position and electron-donor groups the 5-position. The activation energies for the equilibrations were in the region of 14 kcal./mole.Keywords
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