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A radical path to 1,2-diphosphacyclobutenes.

Maria K Uttendorfer1, Lisa M Schneider1, Lukas S Diener1

  • 1Institute of Inorganic Chemistry, University of Regensburg, 93040 Regensburg, Germany. robert.wolf@ur.de.

Chemical Communications (Cambridge, England)
|October 15, 2025
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Summary
This summary is machine-generated.

Researchers synthesized novel 1,2-diphosphacyclobutene derivatives from di-tert-butyldiphosphatetrahedrane. The study also achieved the first synthesis of 1,2-dihydro-1,2-diphosphacyclobutene, a previously elusive compound.

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Area of Science:

  • Organometallic Chemistry
  • Phosphorus Chemistry

Background:

  • Di-tert-butyldiphosphatetrahedrane is a unique phosphorus cage compound.
  • The synthesis of novel phosphorus heterocycles is of significant interest in synthetic chemistry.

Purpose of the Study:

  • To explore the reactivity of di-tert-butyldiphosphatetrahedrane with electrophilic reagents.
  • To synthesize and characterize new 1,2-diphosphacyclobutene derivatives.
  • To achieve the synthesis of the elusive 1,2-dihydro-1,2-diphosphacyclobutene.

Main Methods:

  • Reaction of di-tert-butyldiphosphatetrahedrane with Mes*O˙, (PhSe)₂, and I₂.
  • Reduction of a resulting 1,2-diphosphacyclobutene derivative using LiAlH₄.

Main Results:

  • Successful synthesis of 1,2-diphosphacyclobutene derivatives with R = OMes*, SePh, and I.
  • Isolation and characterization of the previously elusive 1,2-dihydro-1,2-diphosphacyclobutene.

Conclusions:

  • Di-tert-butyldiphosphatetrahedrane serves as a versatile precursor for 1,2-diphosphacyclobutene synthesis.
  • The developed methods provide access to novel phosphorus-containing cyclic compounds.
  • The synthesis of the dihydro derivative expands the scope of known diphosphacyclobutene structures.