In a glovebox, an oven dried screw-capped 2 mL vial was charged with a magnetic stir bar, Ni( tBu stb)3 (10 μmol), carbene ligand Me IPr tBu (10 μmol), freshly distilled and degassed (free pump thaw) toluene (0.1 mL) was then added and the catalyst mixture was stirred at room temperature for 30 min, then 1,3-cyclohexadiene (0.2 mmol) was then added during which a green black solution is formed. The mixture was stirred at room temperature for 10 minutes, Ketone (0.1 mmol) was then added successively. The vial was sealed with a Teflon-lined screw cap, and running inside the glovebox at 40 o C After 24 h, the vial was shipped outside of the glovebox. The reaction mixture was diluted with dichloromethane and filtered through a plug of silica gel. The crude solution was concentrated in vacuum and subjected to column chromatography 100:1 PE/EA to isolate the products.