2-oxoglutarate (OG)- and Fe(II)-dependent dioxygenase (2OGD) involved in scopoletin and umbelliferone biosynthesis (PubMed:22169019). Converts feruloyl CoA into 6'-hydroxyferuloyl CoA, and p-coumaroyl CoA into 2,4-dihydroxycinnamoyl-CoA, but has no activity toward caffeoyl-CoA (PubMed:22169019). (E)-4-coumaroyl-CoA + 2-oxoglutarate + O2 = (E)-2,4-dihydroxycinnamoyl-CoA + CO2 + succinate (E)-feruloyl-CoA + 2-oxoglutarate + O2 = (E)-6-hydroxyferuloyl-CoA + CO2 + succinate Binds 1 Fe(2+) ion per subunit. kcat is 0.35 sec(-1) with feruloyl-CoA as substrate. kcat is 0.33 sec(-1) with p-Coumaroyl-CoA as substrate. Optimum pH is 7.2. Phenylpropanoid metabolism. Mostly expressed in underground stems and stems. Transiently induced by fungal (F.oxysporum f.sp. batatas O-17) and chitosan treatments, in association with the accumulation of umbelliferone and its glucoside (skimmin) in the tubers. Belongs to the iron/ascorbate-dependent oxidoreductase family.