Nickel Boride Catalyst in Organic Synthesis—The Effects of Promoters on Nickel Borides for Hydrogenation Reactions

Cr, Co and Rh were introduced into P‐1, P‐2 and P‐2W nickel boride catalysts as promoters. The substrates of cyclohexanone and cyclohexene were used to examine the effects of those promoters on nickel borides for hydrogenation reactions. On cyclohexanone with strongly‐polared carbonyl group, Cr, Co and Rh are effective for all nickel borides. On cyclohexene with slightly‐polared olefinic group, Rh is also good for all nickel borides. But Cr and Co are only effective for P‐2W and P‐1 nickel borides respectively.