Abstract
It is known that some colloidal catalysts show “homogeneous”-like behavior, but it is unclear which parameters define the borderline between heterogeneous, i.e. surface reactions, and homogeneous-type catalysis of colloidal systems. The reaction of ethynylbenzene (phenylacetylene) with parahydrogen using the colloidal palladium catalyst Pd x [(N(octyl) 4Cl] y leads to nuclear spin polarization in the hydrogenation products. Accordingly, the in situ NMR method parahydrogen induced polarization (PHIP) is an appropriate tool to investigate hydrogenation mediated by colloidal catalysts.
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