The nickel complexes of Schiff bases formed from omicron-aminothiophenol and alpha-dicarbonyl
compounds, Ni(omicron-SC6H4N = CRCR = NC6H4S-omicron) (R = H, Me, Ph) (1a-c), catalyse
the reduction of aromatic nitro compounds by NaBH4. The reduced species [Ni(omicron-SC6H4N
= CHCH = NC6H4S-omicron)]- (2) and [Ni(omicron-SC6H4NHCH2CH = NC6H4S-omicron)]- (3)
were identified as intermediates in the catalytic cycle.