Abstract
Homogeneous hydrogenation with parahydrogen yields strong nuclear spin polarization in the 1H NMR spectra of the reaction products. This polarization can be transferred to subsequent reaction products and detected by in situ1H NMR spectroscopy. As a typical example, the hydrogenation of 1-phenylpropyne with parahydrogen generates the spin-polarized molecule 1-phenylpropene. Upon bromination of this product, its polarization is transferred to the reaction product 1,2-dibromo-1-phenylpropane. As a second example, polarization was observed in the addition product of DBr to spin-polarized dimethyl maleate which is generated from dimethyl acetylenedicarboxylate by addition of parahydrogen. Copyright © 2000 John Wiley & Sons, Ltd.
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