. Author manuscript; available in PMC: 2014 Sep 4.

Published in final edited form as: J Am Chem Soc. 2013 Aug 22;135(35):13168–13184. doi: 10.1021/ja406608u

Table 5. Comparison of various bis(arylimidazol-2-ylidene)pyridine cobalt precursors for the catalytic for the hydrogenation of trans-methylstilbene.

Cobalt Compound	Solvent	Conversion^a^,^b
(^iPrCNC)CoCH₃	C₆H₆	50%
(^iPrCNC)CoCH₃	C₆H₅F	14%
(4-H₂-^iPrCNC)CoN₂	C₆H₆	27%
[(^iPrCNC)CoN₂][BAr^F₄]^c	C₆H₆	27%
[(^iPrCNC)CoN₂][BAr^F₄]	C₆H₅F	6%

All catalytic reactions carried out with 5 mol% of the metal complex (0.032 mmol) in 0.916 M substrate solution in the desired solvents with 4 atm of H₂ at 22 °C.

Conversions determined by GC-FID.

Generated in situ using (^iPrCNC)CoBr and 1.05 eq. NaBAr^F₄.