Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 2, Pages 598-601Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja410396g
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Funding
- RFBR [12-03-31386-mol_a, 12-03-00403-a]
- RAS [5.1.1]
- SB RAS [60, 61, 57, 122]
- program of support of leading scientific schools [NSh-2429.2012.3]
- program of the Russian Government [11.G34.31.0045]
- Academy of Finland [24301390, 139550]
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To date, only metal-containing hydrogenation catalysts have been utilized for producing substantial NMR signal enhancements by means of parahydrogen-induced polarization (PHIP). Herein, we show that metal-free compounds known as molecular tweezers are useful in this respect. It is shown that ansa-aminoborane tweezers QCAT provided. (20-30)-fold signal enhancements of parahydrogen-originating hydrogens in H-1 NMR spectra. Nuclear polarization transfer from the polarized hydrogens to B-11 nuclei leads to a 10-fold enhancement in the B-11 NMR spectrum. Moreover, our results indicate that dihydrogen activation by QCAT and CAT tweezers is carried out in a pairwise manner, and PHIP can be used for understanding the activation mechanism in metal-free catalytic systems in general.
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