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Related Concept Videos

VSEPR Theory02:37

VSEPR Theory

Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
07:49

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Published on: February 20, 2020

Preorganized frustrated Lewis pairs.

Federica Bertini1, Volodymyr Lyaskovskyy, Brian J J Timmer

  • 1Department of Chemistry and Pharmaceutical Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands.

Journal of the American Chemical Society
|December 22, 2011
PubMed
Summary
This summary is machine-generated.

Geminal frustrated Lewis pairs (FLPs) show enhanced reactivity when their donor and acceptor sites are perfectly aligned. This study demonstrates this effect for a nonfluorinated FLP reacting with H(2), CO(2), and isocyanates.

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Area of Science:

  • Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Frustrated Lewis pairs (FLPs) are Lewis acid-base pairs that remain reactive due to steric hindrance.
  • Geminal FLPs, where donor and acceptor sites are on the same carbon atom, offer unique structural possibilities.
  • Perfect alignment of donor and acceptor sites in geminal FLPs is hypothesized to increase reactivity.

Purpose of the Study:

  • To investigate the reactivity of a nonfluorinated geminal FLP with perfectly aligned donor and acceptor sites.
  • To explore the reactions of this FLP with small molecules like H(2), CO(2), and isocyanates.
  • To computationally support the experimental findings on FLP reactivity.

Main Methods:

  • Synthesis and characterization of the nonfluorinated geminal FLP, tBu(2)PCH(2)BPh(2).
  • Experimental studies of the FLP's reactions with H(2), CO(2), and isocyanates.
  • Density Functional Theory (DFT) calculations to model reaction mechanisms and energetics.

Main Results:

  • The nonfluorinated geminal FLP tBu(2)PCH(2)BPh(2) successfully reacted with H(2), CO(2), and isocyanates.
  • Experimental evidence supports the hypothesis that perfect alignment enhances FLP reactivity.
  • Computational studies corroborate the observed reactivity and provide insights into the transition states.

Conclusions:

  • Geminal FLPs with perfectly aligned donor and acceptor sites exhibit significantly increased reactivity.
  • The nonfluorinated FLP tBu(2)PCH(2)BPh(2) serves as a model system for studying enhanced FLP reactivity.
  • This work provides a foundation for designing novel FLPs with tailored reactivity for various chemical transformations.