CrossRef enabled

PAC Archives

Archive →

Pure Appl. Chem., 2000, Vol. 72, No. 9, pp. 1769-1772

From phosphatriafulvenes to phosphabenzenes and stable six-membered phosphaallenes

Michael A. Hofmann, Uwe Bergsträßer and Manfred Regitz

Fachbereich Chemie der Universität Kaiserslautern, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany

Abstract: Phosphatriafulvenes readily react with kinetically stabilized phosphaalkynes. Depending on the substituent at the phosphorus atom of the phosphatriafulvene, different six-membered phosphaheterocycles can be isolated. On the one hand, 1,3-diphosphabenzenes are formed, which can be isomerized thermally to diphospha dewarbenzenes or complexed by Cr(CO)3. On the other hand, 1,3-diphosphaisobenzenes are thus available. They are converted to bicyclic six-membered allenes via 1,3-dipolar cycloaddition to the P/C double bond.