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Related Experiment Videos

Methylene-azaphosphirane as a reactive intermediate.

J Chris Slootweg1, Mark J M Vlaar, Danielle J Vugts

  • 1Department of Organic and Inorganic Chemistry, Faculty of Sciences, Vrije Universiteit, Amsterdam, The Netherlands.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 15, 2005
PubMed
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Novel phosphorus heterocycles, 2-aminophosphindoles and methylene-2,3-dihydro-1H-benzo[1,3]azaphospholes, were synthesized from phosphinidene complexes and ketenimines. DFT analysis revealed strain-driven rearrangements of a methylene-azaphosphirane intermediate dictate product selectivity.

Area of Science:

  • Organometallic Chemistry
  • Synthetic Organic Chemistry
  • Computational Chemistry

Background:

  • Transient phosphinidene complexes are reactive intermediates in organophosphorus chemistry.
  • Ketenimines are versatile building blocks for heterocyclic synthesis.

Purpose of the Study:

  • To investigate the reaction of phosphinidene complexes with N-substituted-diphenylketenimines.
  • To elucidate the reaction mechanism and identify novel phosphorus-containing heterocycles.

Main Methods:

  • Synthesis of novel 2-aminophosphindoles and related heterocycles.
  • X-ray crystallography for structural confirmation.
  • Density Functional Theory (DFT) calculations to analyze reaction pathways.

Main Results:

Related Experiment Videos

  • Unexpected formation of 2-aminophosphindoles from phosphinidene complexes and ketenimines.
  • Identification of a methylene-azaphosphirane intermediate.
  • DFT analysis revealed strain-driven [1,5]- and [1,3]-sigmatropic shifts leading to different heterocycles.

Conclusions:

  • The reaction provides a novel route to substituted 2-aminophosphindoles.
  • The methylene-azaphosphirane intermediate is key, with its rearrangement pathways controlled by substituents.
  • This work highlights the utility of phosphinidene complexes in constructing complex phosphorus heterocycles.