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. Author manuscript; available in PMC: 2018 Jan 18.
Published in final edited form as: Chemistry. 2016 Dec 5;23(4):725–751. doi: 10.1002/chem.201603884

Figure 9.

Figure 9

a) Molecular diagram of parahydrogen (para-H2) addition to the substrate performed with a homogeneous or heterogeneous catalyst. b) PASADENA effect: nuclear spin energy level diagram of para-H2 at high magnetic field (left), An AX spin system is formed upon pairwise addition of para-H2 to the unsaturated substrate at high magnetic field and corresponding 1H NMR spectrum (right). c) ALTADENA effect: nuclear spin energy level diagram of para-H2 at low magnetic field (left), An AB spin system is formed upon pairwise addition of para-H2 to the unsaturated substrate at low magnetic field, An AX spin system is obtained after adiabatic transfer of the reaction product from low to high magnetic field. The corresponding 1H NMR spectrum is shown at right.