Diarylethylenes and 9,9′-bifluorenylidene are hydrogenated, in excellent yields, on treatment with cobalt carbonyl or bis(tri-n-butylphosphine)dicobalt hexacarbonyl, benzene, 48–50% aqueous tetrafluoroboric acid, and sodium 4-dodecylbenzenesulphonate.
H. Alper and J. Heveling, J. Chem. Soc., Chem. Commun., 1983, 365 DOI: 10.1039/C39830000365
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