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

 

 

From phosphatriafulvenes to phosphabenzenes and stable
six-membered phosphaallenes*

Michael A. Hofmann, Uwe Bergsträ�er, and Manfred Regitz**

Fachbereich Chemie der Universität Kaiserslautern, Erwin-Schrödinger-Stra�e, 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.

*Lecture presented at the 13th International Conference on Organic Synthesis (ICOS-13), Warsaw, Poland, 1-5 July 2000.
** Corresponding author

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