Solution and solid state structure of highly delocalised 5-triphenylphosphoranylidene-cyclopentene-3,4-diones

Robert Alan Aitken, EN Kozminykh, VO Kozminykh, Philip Lightfoot

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The fully assigned C-13 NMR spectra of the cyclic ylides 4 and 5 show that the C-1-C-2 bond is very strongly polarised consistent with substantial delocalisation of the ylide negative charge on to C-2. The X-ray structure of 5 confirms the occurrence of extensive delocalisation involving a significant contribution from up to six separate resonance forms.

Original languageEnglish
Pages (from-to)487-492
Number of pages6
JournalPhosphorus, Sulfur, and Silicon and the Related Elements
Issue number1
Publication statusPublished - Mar 1998


  • phosphorus ylides
  • X-ray structure
  • C-13 NMR spectra
  • delocalisation
  • cyclic ylides


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