Pure Appl. Chem., 2000, Vol. 72, No. 9, pp. 1769-1772
http://dx.doi.org/10.1351/pac200072091769
From phosphatriafulvenes to phosphabenzenes and stable six-membered phosphaallenes
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.