O-Methylation of phenylphenalenone phytoalexins in Musa acuminata and Wachendorfia thyrsiflora

Labelled precursors were used to study biosynthetic O-methylation in various positions of the backbone of phenylphenalenones by NMR spectroscopic methods. The inducible formation of (methoxy)phenylphenalenones after treatment with jasmonic acid and copper chloride has been shown.