Catalyzes the CoA transfer from succinate to 3-oxoadipate (beta-ketoadipate). 3-oxoadipate + succinyl-CoA = 3-oxoadipyl-CoA + succinate Optimum pH is 8.4. Aromatic compound metabolism; beta-ketoadipate pathway; acetyl-CoA and succinyl-CoA from 3-oxoadipate: step 1/2. Heterotetramer composed of 2 A and 2 B subunits. Belongs to the 3-oxoacid CoA-transferase subunit A family.