Involved in the biosynthesis of the floral volatile isoeugenol (PubMed:16782809, PubMed:17241449, PubMed:19222805). Catalyzes the synthesis of the phenylpropene isoeugenol from coniferyl acetate (PubMed:16782809, PubMed:17241449, PubMed:19222805). Phenylpropenes are the primary constituents of various essential plant oils (PubMed:16782809). They are produced as antimicrobial and antianimal compounds, or as floral attractants of pollinators (PubMed:16782809). Isoeugenol is a characteristic aromatic constituent of spices and a floral volatile compound (PubMed:16782809). acetate + NADP(+) + trans-isoeugenol = (E)-coniferyl acetate + NADPH Inhibited by zinc and copper ions (PubMed:16782809). Repressed by 4-bromo-cinnamyl acetate (PubMed:16782809). kcat is 1.3 sec(-1) with coniferyl acetate as substrate. Optimum pH is 6.5. Aromatic compound metabolism; phenylpropanoid biosynthesis. Expressed in flowers, especially in corolla and tubes of petals, probably in both epidermal and mesophyll cell layers. In corollas, accumulates progressively during flower development, from buds to anthesis. Up-regulated by EOBII (PubMed:20543029). Triggered by EOBI in flowers via the regulation of its promoter (PubMed:23275577). Circadian-regulation with peak levels occurring at the end of the light period in flowers; this expression is monitored by LHY binding and repression to cis-regulatory evening elements in its promoter (PubMed:26124104). Accumulation of eugenol but reduced isoeugenol levels in flowers. Belongs to the NmrA-type oxidoreductase family.