Homogeneous Hydrogenation of Norbornadiene with Parahydrogen and Phosphonic Ester Phosphine Rhodium Complexes Studied by in situ NMR Spectroscopy

Author

Andreas Harthun
Klaus Woelk, Missouri University of Science and TechnologyFollow
Joachim Bargon
Axel Weigt

Abstract

Homogeneous hydrogenation of norbornadiene with enriched parahydrogen (p-H₂) and phosphonic ester phosphine rhodium complexes is detected using in situ NMR spectroscopy The obtained polarization spectra remain unchanged during the catalysis in thf-d₈ as a solvent but change with time when the hydrogenation is executed in acetone-d₆. The observed phenomenon is attributed to a change of the phase correlation of the transferred parahydrogen nuclei via nuclear singlet-triplet (S/T₀) mixing during the reaction. Simultaneously, ³¹P NMR spectra change indicating a change in the nature of the original rhodium complex when the hydrogenation is carried out in acetone-d₆.

Recommended Citation

A. Harthun et al., "Homogeneous Hydrogenation of Norbornadiene with Parahydrogen and Phosphonic Ester Phosphine Rhodium Complexes Studied by in situ NMR Spectroscopy," Tetrahedron, vol. 51, no. 41, pp. 11199 - 11206, Elsevier, Oct 1995.

The definitive version is available at https://doi.org/10.1016/0040-4020(95)00687-4

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0040-4020

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1995 Elsevier, All rights reserved.

Publication Date

01 Oct 1995