Investigation of the composition of Co(0) complexes in Ziegler type catalytic systems

Borohydride reduction of acetophenone and esters of dehydrocarboxylic acids in the presence of chiral cobalt(II) diamine complexes

“…The highest optical yields of the product (S) isomer were obtained for complex 5c or in a catalytic system containing diamine 1c (see Table 1, runs [11][12][13][14][15][16][17][18]. The highest optical yields of the product (S) isomer were obtained for complex 5c or in a catalytic system containing diamine 1c (see Table 1, runs [11][12][13][14][15][16][17][18].…”

“…18 This retards aggregation of Co 0 particles to give larger particles resulting in precipitation. Conversely, hydrogenation of diester 4 in DMF, which is a good complexing agent, barely gives any precipitate.…”