Biflavones I (R = Ph, 4-MeOC6H4) were prepd. from diketone II (R1 = Me, R2 = H) via rearrangement of II (R1 = Bz, 4-MeOC6H4CO, R2 = H) to II (R1 = H, R2 = Bz, 4-MeOC6H4CO). [on SciFinder (R)]
Qian Wang, Jieping Zhu, Hua Wu
Rosario Scopelliti, Marinella Mazzanti, Anne-Sophie Chauvin, Radmila Faizova