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Carbon‐13 NMR studies of benzoquinones

1981; Wiley; Volume: 15; Issue: 3 Linguagem: Inglês

10.1002/mrc.1270150321

0030-4921

Pedro Joseph‐Nathan, D. Abramo‐Bruno, D. A. Ortega,

Morinda citrifolia extract uses

Abstract The assignment of all ring carbons of p ‐benzoquinones derived from perezone and from thymoquinone was completed using gated decoupled spectra. The long range proton‐carbon couplings are discussed in terms of the degree of substitution of the quinone ring. The tautomeric interconversion of the two energetically equivalent forms of 2,5‐dihydroxy‐1,4‐benzoquinones has been studied in various solvents and at several temperatures.