Phosphirenium Ion
Phosphirenium ions () are a series of organophosphorus compounds containing unsaturated three-membered ring phosphorus (V) Heterocyclic compound, heterocycles and σ*-aromaticity is believed to be present in such molecules. Many of the salts containing phosphirenium ions have been isolated and characterized by Nuclear magnetic resonance spectroscopy, NMR spectroscopy and X-ray crystallography. Synthesis The first series of phosphirenium ions were synthesized by reacting alkynes with methyl- or phenylphosphonous dichloride and aluminum trichloride. These reactions may be regarded as formal addition of "RClP+" to alkynes. [2+1]-cycloaddition reactions between phosphaalkynes and chlorocarbene give phosphirenes, which serve as starting materials for the generation of phosphirenium species. Treatment of diphenylphosphine oxide with diphenylacetylene affords phosphirenium species. Phosphirenium ions can also be obtained from reaction between phosphiranes and alkynes, where "RClP+ ...
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