Natural abundance carbon-13 nuclear magnetic resonance spectra of several sydnones and related mesoionic compounds have been measured, the data indicating considerable shielding of C(4) in sydnones as predicted by earlier ab initio SCF–MO and semi-empirical MO calculations.
M. T. W. Hearn and K. T. Potts, J. Chem. Soc., Perkin Trans. 2, 1974, 875 DOI: 10.1039/P29740000875
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