Prediction of (19)F NMR Chemical Shifts for Fluorinated Aromatic Compounds.

Prediction of (19)F NMR Chemical Shifts for Fluorinated Aromatic Compounds.
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DOI:
10.1021/acs.joc.8b00104
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发表时间:
2018-03-16
期刊:
The Journal of organic chemistry
影响因子:
--
通讯作者:
Tantillo DJ
Tantillo DJ
中科院分区:
其他
文献类型:
--
作者:
Saunders C;Khaled MB;Weaver JD 3rd;Tantillo DJ

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报道了标度因子用于预测理论水平相对较低的含氟(杂)芳香族化合物的~(19)F核磁共振化学位移。我们推荐的比例因子是使用50种化合物的精选数据集开发的,其中100个19F位移跨越>150ppm的范围。由于实验位移和计算位移之间的最大偏差为6.5ppm,或测试范围的4%,这些比例系数允许将化学位移分配给多氟芳烃中的特定氟化物。这一方法的效用通过几项结构调整得到突出说明。
Scaling factors are reported for use in predicting 19F NMR chemical shifts for fluorinated (hetero)aromatic compounds with relatively low levels of theory. Our recommended scaling factors were developed using a curated data set of >50 compounds, with 100 individual 19F shifts spanning a range of >150 ppm. With a maximum deviation of 6.5 ppm between experimental and computed shifts, or 4% of the range tested, these scaling factors allow for the assignment of chemical shifts to specific fluorines in multifluorinated aromatics. The utility of this approach is highlighted by several structural reassignments.
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