Oxyfunctionalization of unactivated C–H bonds in triterpenoids with tert-butylhydroperoxide catalyzed by meso-5,10,15,20-tetramesitylporphyrinate osmium(II) carbonyl complex - Ogawa, S; Wakatsuki, Y; Makino, M; Fujimoto, Y; Yasukawa, K; Kikuchi, T; Ukiya, M; Akihisa, T; Iida, T (Chem Phys Lipids, 2010)