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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