Reduction of diphenylacetylene with deuterium gas using the py3RhCl3–Me2N·CHO–NaBH4 catalyst system is found to involve deuterium incorporation at the ortho-position of the phenyl group of the product, trans-stilbene, considered to arise by a mechanism of ortho-deuteriation accompanied by 1,3-hydride shift.
P. Abley and F. J. McQuillin, J. Chem. Soc. D, 1969, 1503 DOI: 10.1039/C29690001503
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