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Published on: March 1, 2020
Towards water-tolerant ansa-aminoboranes for parahydrogen-induced polarization and beyond
Karolina Konsewicz1, Timo Repo2, Vladimir V Zhivonitko1
1NMR Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, Oulu, 90014, Finland. vladimir.zhivonitko@oulu.fi.
Abstract:
Three orders of magnitude of 1H NMR signal enhancement were observed in the metal-free activation of parahydrogen using an ansa-aminoborane in the presence of a 100-fold water excess at 9.4 T. Kinetic studies corroborated the reversibility of water addition to the intramolecular N-B Lewis centers in both polar and nonpolar solvents. Furthermore, DFT modeling supported these results.
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