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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Highly electrophilic silver carbenes.

Xiaolong Zhang1, Linxuan Li1, Paramasivam Sivaguru1

  • 1Department of Chemistry, Northeast Normal University, 5268 Renmin Street, 130024, Changchun, P. R. China. bixh507@nenu.edu.cn.

Chemical Communications (Cambridge, England)
|December 1, 2022
PubMed
Summary

This study introduces a novel method for carbene transfer reactions using stable N-sulfonylhydrazone precursors. This approach generates highly electrophilic silver carbenes, enabling new synthetic transformations with high efficiency and selectivity.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Catalytic carbene transfer reactions are vital for synthesizing complex molecules.
  • Traditional methods often rely on unstable diazoalkane precursors, limiting their scope.
  • Existing methodologies primarily use diazoacetates, overlooking other diazo compounds.

Purpose of the Study:

  • To develop an alternative, safer carbene transfer strategy using N-sulfonylhydrazones.
  • To explore the reactivity of highly electrophilic silver carbenes generated from these precursors.
  • To enable novel intermolecular transformations with non-stabilized carbenes.

Main Methods:

  • Formation of highly electrophilic silver carbenes from readily accessible N-sulfonylhydrazones.
  • Utilizing these silver carbenes in various intermolecular carbene transfer reactions.
  • Characterization of reaction products and analysis of selectivity and efficiency.

Main Results:

  • Demonstrated successful carbene transfer reactions using N-sulfonylhydrazones as precursors.
  • Achieved novel transformations including C(sp3)-H insertion, C(sp3)-C(O) insertion, cycloaddition, and defluorinative functionalization.
  • Observed high efficiency, unusual reactivity, and exceptional selectivity in silver-catalyzed reactions.

Conclusions:

  • N-sulfonylhydrazones offer a stable and sustainable alternative for generating reactive carbenes.
  • Highly electrophilic silver carbenes facilitate novel intermolecular carbene transfer reactions.
  • This research provides fundamental insights into silver carbene chemistry and its potential for broader applications, including asymmetric catalysis.