[1+4] Cycloaddition of a Diphosphene to α,β unsaturated Carbonyl Compounds: Synthesis of Dihydro-1,2-λ5-oxaphospholes with Exocyclic P=P-Bonds and X-ray Structure Analysis of (η5-C5Me5)(CO)2Fe-P[OCH=CH-CH2](=PAr) (Ar = 2,4,6-t-Bu3C6H2)

Weber L, Frebel M, Boese R. [1+4] Cycloaddition of a Diphosphene to α,β unsaturated Carbonyl Compounds: Synthesis of Dihydro-1,2-λ5-oxaphospholes with Exocyclic P=P-Bonds and X-ray Structure Analysis of (η5-C5Me5)(CO)2Fe-P[OCH=CH-CH2](=PAr) (Ar = 2,4,6-t-Bu3C6H2). Organometallics. 1989;8(7):1718-1722