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Title: Para-hydrogen induced polarization in heterogeneous hydrogenationreactions

Abstract

We demonstrate the creation and observation ofpara-hydrogen-induced polarization in heterogeneous hydrogenationreactions. Wilkinson's catalyst, RhCl(PPh3)3, supported on eithermodified silica gel or a polymer, is shown to hydrogenate styrene intoethylbenzene and to produce enhanced spin polarizations, observed throughNMR, when the reaction was performed with H2 gas enriched in the paraspinisomer. Furthermore, gaseous phase para-hydrogenation of propylene topropane with two catalysts, the Wilkinson's catalyst supported onmodified silica gel and Rh(cod)(sulfos) (cod = cycloocta-1,5-diene;sulfos) - O3S(C6H4)CH2C(CH2PPh2)3) supported on silica gel, demonstratesheterogeneous catalytic conversion resulting in large spin polarizations.These experiments serve as a direct verification of the mechanism ofheterogeneous hydrogenation reactions involving immobilized metalcomplexes and can be potentially developed into a practical tool forproducing catalyst-free fluids with highly polarized nuclear spins for abroad range of hyperpolarized NMR and MRI applications.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
COLLABORATION - Int. Tomog.Ctr./Russia
OSTI Identifier:
917307
Report Number(s):
LBNL-62053
Journal ID: ISSN 0002-7863; JACSAT; R&D Project: 508601; BnR: KC0203010; TRN: US200816%%503
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Journal of theAmerican Chemical Society
Additional Journal Information:
Journal Volume: 129; Journal Issue: 17; Related Information: Journal Publication Date: 05/02/07; Journal ID: ISSN 0002-7863
Country of Publication:
United States
Language:
English
Subject:
36; CATALYSTS; HYDROGENATION; POLARIZATION; PROPANE; PROPYLENE; SILICA GEL; SPIN; STYRENE; VERIFICATION; para-hydrogen PASADENA ALTADENA PHIP gas phasepolarization

Citation Formats

Koptyug, Igor V, Kovtunov, Kirill, Burt, Scott R, Anwar, M Sabieh, Hilty, Christian, Han, Song-I, Pines, Alexander, and Sagdeev, Renad Z. Para-hydrogen induced polarization in heterogeneous hydrogenationreactions. United States: N. p., 2007. Web. doi:10.1021/ja068653o.
Koptyug, Igor V, Kovtunov, Kirill, Burt, Scott R, Anwar, M Sabieh, Hilty, Christian, Han, Song-I, Pines, Alexander, & Sagdeev, Renad Z. Para-hydrogen induced polarization in heterogeneous hydrogenationreactions. United States. https://doi.org/10.1021/ja068653o
Koptyug, Igor V, Kovtunov, Kirill, Burt, Scott R, Anwar, M Sabieh, Hilty, Christian, Han, Song-I, Pines, Alexander, and Sagdeev, Renad Z. 2007. "Para-hydrogen induced polarization in heterogeneous hydrogenationreactions". United States. https://doi.org/10.1021/ja068653o.
@article{osti_917307,
title = {Para-hydrogen induced polarization in heterogeneous hydrogenationreactions},
author = {Koptyug, Igor V and Kovtunov, Kirill and Burt, Scott R and Anwar, M Sabieh and Hilty, Christian and Han, Song-I and Pines, Alexander and Sagdeev, Renad Z},
abstractNote = {We demonstrate the creation and observation ofpara-hydrogen-induced polarization in heterogeneous hydrogenationreactions. Wilkinson's catalyst, RhCl(PPh3)3, supported on eithermodified silica gel or a polymer, is shown to hydrogenate styrene intoethylbenzene and to produce enhanced spin polarizations, observed throughNMR, when the reaction was performed with H2 gas enriched in the paraspinisomer. Furthermore, gaseous phase para-hydrogenation of propylene topropane with two catalysts, the Wilkinson's catalyst supported onmodified silica gel and Rh(cod)(sulfos) (cod = cycloocta-1,5-diene;sulfos) - O3S(C6H4)CH2C(CH2PPh2)3) supported on silica gel, demonstratesheterogeneous catalytic conversion resulting in large spin polarizations.These experiments serve as a direct verification of the mechanism ofheterogeneous hydrogenation reactions involving immobilized metalcomplexes and can be potentially developed into a practical tool forproducing catalyst-free fluids with highly polarized nuclear spins for abroad range of hyperpolarized NMR and MRI applications.},
doi = {10.1021/ja068653o},
url = {https://www.osti.gov/biblio/917307}, journal = {Journal of theAmerican Chemical Society},
issn = {0002-7863},
number = 17,
volume = 129,
place = {United States},
year = {Wed Jan 31 00:00:00 EST 2007},
month = {Wed Jan 31 00:00:00 EST 2007}
}