Organophosphorus Compounds, Part 149. Preparation of 1,3-Oxaphospholes by Transition Metal-Catalyzed Reactions of α-Diazo-β-dicarbonyl Compounds with tert-Butylphosphaacetylene - Ruf, Sven G; Mack, Andreas; Steinbach, Jörg; Bergsträßer, Uwe; Regitz, Manfred (Synthesis, 2000)