1. Org. Magn. Reson. 1983, 21(8), 474-481
The shielding of H- in the stabilized rotameric forms of ,-di-tert-butylthioacetic esters. The electric and magnetic anisotropic effects of the thione group.
S. N. Balasubrahmanyam, S. Narasimha Bharathi, G. Usha
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http://dx.doi.org/10.1002/omr.12702108052. Chem. Commun. 1966, 754 - 755
The anisotropies of the carbonyl group
J. W. ApSimon, W. G. Craig, P. V. Demarco, D. W. Mathieson, A. K. G. Nasser, L. Saunders and W. B. Whalley
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http://dx.doi.org/10.1039/C19660000754