Correlation Between Experimental and DFT/GIAO Computed 13C NMR Chemical Shifts of Organic Compounds. Effects of Asymmetry

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Correlation Between Experimental and DFT/GIAO Computed C NMR Chemical Shifts of Organic Compounds. Effects of Asymmetry

Abstract: The experimental C chemical shifts of five different series of organic compounds are compared with predicted C NMR chemical shifts obtained via empirically scaled GIAO shieldings. Our results indicate that the inclusion of a scaling factor allow to obtain an excellent correlation between δcalc and δexp. Although the inclusion of asymmetry improves this correlation, such enhancement wa...

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Accurate (rms error ∼3 ppm) predictions of 13C chemical shifts are achieved for many of the common structural types of organic molecules through empirical scaling of shieldings calculated from gauge including atomic orbitals (GIAO) theory with a small basis set and with geometries obtained from computationally inexpensive molecular mechanics methods. Earlier GIAO calculations are shown to be mu...

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ژورنال

عنوان ژورنال: The Open Natural Products Journal

سال: 2012

ISSN: 1874-8481

DOI: 10.2174/1874848101205010001