Five- and Six-Membered Nickelacyclic Carboxylates as Reagents for the Facile Synthesis of δ-Ketocarboxylic Acids, Isocoumarins, and 1,3-Dicarbonyl Derivatives of Benzoic Acid - Langer, Jens; Gärtner, Martin; Görls, Helmar; Walther, Dirk (Synthesis, 2006)