Short incubation (1 -5 h) of aromatic dinitriles with resting cells of Rhodococcus equi A4 produces the correspondin.~ cyano amides in 48 -81% yield. The substrate reactivity decreases m order 1,4-> 1,3± > 1,2-dlsubstitution. Prolonged ~eatment (20 -50 h) is needed to achieve the conversion to acid or for transformation of the second cyano group.