Borohydride-reduced nickel (P-2 Ni), used with kethylenediamine, is highly stereospecific for the hydrogenation of alkynes to pure olefins with cis:trans ratios as high as 200:1.
C. A. Brown and V. K. Ahuja, J. Chem. Soc., Chem. Commun., 1973, 553 DOI: 10.1039/C39730000553
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