Baik, Tae-Gon Luis, Ana Liza Wang, Long-Cheng Krische, Michael J. A Diastereoselective Metal-Catalyzed [2 + 2] Cycloaddition of Bis-enones A Diastereoselective Metal-Catalyzed [2 + 2] Cycloaddition of Bis-enones Diastereoselective;Cycloaddition 2001-06-16
    https://acs.figshare.com/articles/journal_contribution/A_Diastereoselective_Metal-Catalyzed_2_2_Cycloaddition_of_Bis-enones/3634479
10.1021/ja010800p.s001