Abstract
This work reports the 13C chemical shifts of 49 iodopyrazoles and the 15N chemical shifts of 6 iodopyrazoles, most of them from the literature but a number of significant cases from the present work. Most experimental data were from solution studies but some of them correspond to the solid state (CPMAS). The calculations include non-relativistic calculations (nr-GIAO) and relativistic ones (ZORA, mDKS/B3LYP/VDZ and mDKS/B3LYP/VTZ). In the case of NH-pyrazoles, problems of tautomerism and desmotropy arise that have been also studied. The manuscript is dedicated to develop some equations containing corrections for heavy atoms to predict 13C and 15N chemical shifts.
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Acknowledgments
This work was carried out with financial support from the Ministerio de Ciencia, Innovación y Universidades (Project PGC2018-094644-B-C2) and Dirección General de Investigación e Innovación de la Comunidad de Madrid (PS2018/EMT-4329 AIRTEC-CM). Thanks are also given to the CTI (CSIC) for their continued computational support.
Funding
Ministerio de Ciencia, Innovación y Universidades (Project PGC2018-094644-B-C2) and Dirección General de Investigación e Innovación de la Comunidad de Madrid (PS2018/EMT-4329 AIRTEC-CM).
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Alkorta, I., Claramunt, R.M., Sanz, D. et al. A 13C chemical shifts study of iodopyrazoles: experimental results and relativistic and non-relativistic calculations. Struct Chem 32, 925–937 (2021). https://doi.org/10.1007/s11224-021-01755-5
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DOI: https://doi.org/10.1007/s11224-021-01755-5