Zhou, R., et al., Parahydrogen enhanced NMR reveals correlations in selective hydrogenation of triple bonds over supported Pt catalyst. Phys Chem Chem Phys, 2015. 17(39): p. 26121-9.
Parahydrogen induced polarization using heterogeneous catalysis can produce impurity-free hyperpolarized gases and liquids, but the comparatively low signal enhancements and limited scope of substrates that can be polarized pose significant challenges to this approach. This study explores the surface processes affecting the disposition of the bilinear spin order derived from parahydrogen in the hydrogenation of propyne over TiO2-supported Pt nanoparticles. The hyperpolarized adducts formed at low magnetic field are adiabatically transported to high field for analysis by proton NMR spectroscopy at 400 MHz. For the first time, the stereoselectivity of pairwise addition to propyne is measured as a function of reaction conditions. The correlation between partial reduction selectivity and stereoselectivity of pairwise addition is revealed. The systematic trends are rationalized in terms of a hybrid mechanism incorporating non-traditional concerted addition steps and well-established reversible step-wise addition involving the formation of a surface bound 2-propyl intermediate.
High-resolution 3D proton MRI of hyperpolarized gas enabled by parahydrogen and Rh/TiO2 heterogeneous catalyst
From The DNP-NMR Blog:
High-resolution 3D proton MRI of hyperpolarized gas enabled by parahydrogen and Rh/TiO2 heterogeneous catalyst
Kovtunov, K.V., et al., High-resolution 3D proton MRI of hyperpolarized gas enabled by parahydrogen and Rh/TiO2 heterogeneous catalyst. Chemistry, 2014. 20(37): p. 11636-9.
http://www.ncbi.nlm.nih.gov/pubmed/24961814
Kinetic Study of Propylene Hydrogenation over Pt/Al2O3 by Parahydrogen-Induced Polarization
From The DNP-NMR Blog:
Kinetic Study of Propylene Hydrogenation over Pt/Al2O3 by Parahydrogen-Induced Polarization
Salnikov, O.G., et al., Kinetic Study of Propylene Hydrogenation over Pt/Al2O3 by Parahydrogen-Induced Polarization. Appl. Magn. Reson., 2012. 44(1-2): p. 279-288.
http://dx.doi.org/10.1007/s00723-012-0400-3
Fundamental Aspects of Parahydrogen Enhanced Low-Field Nuclear Magnetic Resonance
From The DNP-NMR Blog:
Fundamental Aspects of Parahydrogen Enhanced Low-Field Nuclear Magnetic Resonance
Colell, J., et al., Fundamental Aspects of Parahydrogen Enhanced Low-Field Nuclear Magnetic Resonance. Phys. Rev. Lett., 2013. 110(13): p. 137602.
http://www.ncbi.nlm.nih.gov/pubmed/23581373
[Question from NMRWiki Q&A forum] Correlations across glycosidic bonds
Correlations across glycosidic bonds
I am studying carbohydrates and was wanting to know if it was possible to record correlations through the ether linkage of the glycosidic bond in sugars either from the proton or carbon of one sugar top the adjacent sugar or the protons of a Serine or threonine side chain in a glyco-peptide. Would something like a 13C-HSQC-TOCSY cross the glycosidic bond? if not are there experiments that would?
Check if somebody has answered this question on NMRWiki QA forum
Parahydrogen enhanced NMR reveals correlations in selective hydrogenation of triple bonds over supported Pt catalyst
Linear Mode
