C-methyl phenolics from Qualea species

Abstract The trunk wood of Qualea labouriauana contains, besides (2 R )-5,7,4′-trihydroxy-3′-methoxy-6,8-dimethylflavanone, (2 R )-5,7,4′-trihydroxy-8-methylflavanone, the biosynthetically interesting 2,2′-dihydroxy-4,6,4′,6′-tetramethoxy-3,3′-dimethylbenzophenone. From the trunk wood extract of Q. paraensis the first named flavanone crystallized out directly.