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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Oxaphosphiranes: isolable phosphorus-containing epoxide rings.

Niklas Volk1, Antonio García Alcaraz2, Selvakumar Balasubramaniam1

  • 1Institut für Anorganische Chemie, der Rheinischen Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Str. 1, 53121, Bonn, Germany. r.streubel@uni-bonn.de.

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Researchers synthesized novel oxaphosphiranes, which are epoxide rings containing a phosphorus atom. This breakthrough provides isolable compounds with unique reactivity, opening new avenues in organophosphorus chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Synthetic Organic Chemistry
  • Computational Chemistry

Background:

  • Synthesizing heteroatom-containing epoxide rings is challenging due to polar bonds and ring strain.
  • Oxaphosphiranes, epoxide analogs with a phosphorus atom, have been difficult to isolate.

Purpose of the Study:

  • To develop a facile and effective protocol for synthesizing isolable oxaphosphiranes.
  • To explore the reactivity of these novel compounds with acids and bases.
  • To elucidate the electronic structure and reaction mechanisms of oxaphosphiranes using theoretical methods.

Main Methods:

  • Synthesis of oxaphosphiranes using a molybdenum precursor, tert-butyllithium, and fluorinated benzaldehydes.
  • Characterization of the synthesized oxaphosphiranes.
  • Reactions with various acids and bases.
  • Density Functional Theory (DFT) calculations to investigate electronic structure and reaction pathways.

Main Results:

  • The first examples of isolable oxaphosphiranes were successfully synthesized.
  • The protocol proved facile and effective, utilizing readily available starting materials.
  • Reactions with acids and bases demonstrated the unique reactivity of oxaphosphiranes.
  • Theoretical calculations revealed a singlet carbene-like frontier molecular orbital (FMO) situation at the phosphorus atom.

Conclusions:

  • The developed protocol enables the synthesis of stable, isolable oxaphosphiranes.
  • The unique electronic structure at phosphorus dictates the reactivity of oxaphosphiranes.
  • This work expands the scope of organophosphorus chemistry and provides a platform for further investigations.