(untitled) - Ding, C; Wang, L; Chen, H; Wild, C; Ye, N; Ding, Y; Wang, T; White, M A; Shen, Q; Zhou, J (Org. Biomol. Chem., 2014)
Without Yb(fod)3, dimerization of the enone 18 preferentially occurred; for a related reaction, see: