The solid state conformation of oxo stabilised ylides: X-ray structures of four new polyoxo phosphorus ylides

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Abstract

The first X-ray structure determinations of a trioxo ylide 7, a tetraoxo ylide 8, a tetraoxo bis(ylide) 10 and a hexaoxo bis(ylide) 9 show these compounds to exhibit unexpected effects as regards the relative alignment of the 4-8 contiguous C=X units present. Crystal-packing forces are sufficient to over-ride the normal preference for the P=C-C=O unit in such stabilised ylides to have the syn configuration. A survey of all previous X-ray structures of acyclic oxo-stabilised phosphorus and arsenic ylides is also presented.

Original languageEnglish
Pages (from-to)333-340
Number of pages8
JournalJournal of Chemical Society, Perkin Transactions 2
DOIs
Publication statusPublished - 2000

Keywords

  • FLASH-VACUUM PYROLYSIS
  • MOLECULAR-STRUCTURE
  • CRYSTAL-STRUCTURE
  • ORGANIC-COMPOUNDS
  • BETAINES
  • TRIPHENYLARSORANE
  • REACTIVITY
  • ANHYDRIDE
  • LIGANDS
  • ESTERS

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