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Formation of phosphorus heterocycles using a cationic electrophilic phosphinidene complex

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/j.jorganchem.2013.07.076
Keywords
  • Phosphinidene
  • Cycloaddition
  • Phosphorus Heterocycle
  • Metal-Mediated Synthesis

Abstract

Abstract The electrophilic terminal aminophosphinidene complex [CpFe(CO)2P{N-i-Pr2}][X] (Cp = cyclopentadienyl, i-Pr = isopropyl, X = AlCl4 or NaBPh4), generated from [CpFe(CO)2{P(Cl)N-i-Pr2}] by chloride abstraction, reacts with alkynes and alkenes via (1 + 2) cycloaddition to form phosphirenes and phosphiranes respectively. Conjugated alkenes react with [CpFe(CO)2P{N-i-Pr2}]+ to form phosphirane intermediates, which then rearrange to 3-phospholenes. The phosphinidene complex reacts with benzylideneacetone to give an oxo-3-phospholene complex. Azobenzene reacts with [CpFe(CO)2P{N-i-Pr2}]+ to form a benzodiazophosphole via C–H activation. Addition of HCl or HBF4·Et2O to the iron diphenylphosphirene complex and iron benzodiazophosphole complex results in P–N bond cleavage, yielding the respective chlorophosphorus heterocyclic complexes. The heterocycles can be removed from the metal complexes to make metal free phosphorus heterocycles by addition of trimethyl- or triethylphosphine.

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