SEARCH Articles Figures Tables Annulation Thorpe-Ziegler reaction By the Thorpe-Ziegler reaction Radical Thorpe-Ziegler reaction Thorpe-Ziegler annulation Thorpe-Ziegler condensation Thorpe-Ziegler cyclization Thorpe-Ziegler cyclization mechanism Thorpe-Ziegler reaction Thorpe-Ziegler ring closure