1. J. Chem. Soc., Perkin Trans. 2, 1999, 1317 - 1322
Valerije Vrсek, Olga Kronja and Hans-Ullrich Siehl
Predictions of 13C chemical shifts in carbocations. The use of scaled chemical shifts calculated using GIAO DFT methods
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http://dx.doi.org/10.1039/a902184a
D. P. Kelly, G. J. Farquharson, J. J Giansiracusa, W. A. Jensen, H. M. Huegel, A. P. Porter, I. J. Rainbow, P. H. Timewell
Carbon-13-proton coupling constants in carbocations. 3. Variation of .DELTA.J with electron demand in aryldialkyl carbocations
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http://dx.doi.org/10.1021/ja00402a047
George A. Olah, G. K. Surya Prakash, Gao Liang
Stable carbocations. 201. Comparison of carbon-13 nuclear magnetic resonance shifts and relative charge delocalization in para-substituted phenyl, alkyl, and cyclopropylcarbinyl cations
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http://dx.doi.org/10.1021/jo00436a002