13C NMR spectra of benzofuroxan and related compounds
Tóm tắt
The 13C n.m.r. spectrum of benzofuroxan at −15°C is assigned on the basis of selective decoupling experiments and by comparison with the 13C chemical shifts of model compounds. The 13C spectra were also measured in trifluoroacetic acid as a solvent. From the temperature dependence of the 13C spectrum of benzofuroxan in CDCl3, a barrier of 14·0 ± 0·2 kcal mol−1 is obtained for the degenerate tautomerism in this compound.
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Tài liệu tham khảo
Harris R. K., 1963, J. Chem. Soc., 197
Englert G., 1961, Z. Elektrochem., 65, 854
Boulton A. J., 1965, J. Chem. Soc., 5958
Levy G. C., 1972, Carbon‐13 NMR For Organic Chemists, 101
Smith P. A. S., 1963, Org. Synth. Coll., 75
Fitton A. O., 1968, Practical Heterocyclic Chemistry, 65
Behr L. C., 1963, Org. Synth. Coll., 342
F. A. L.Anet V. J.Basus C. H.Bradley andA. K.Cheng paper presented at the 12th Experimental Nuclear Magnetic Resonance Conference Florida February1971.