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π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
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π Molecular Orbitals of the Allyl Radical01:27

π Molecular Orbitals of the Allyl Radical

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Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
The allyl systems have identical molecular orbitals but differ in the number of π electrons....
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Valence Bond Theory02:42

Valence Bond Theory

8.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
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A trimetallic bismuth(I)-based allyl cation.

Davide Spinnato1, Nils Nöthling1, Markus Leutzsch1

  • 1Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany.

Nature Chemistry
|January 6, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel, stable bismuth compound with three Bi(I) centers, mimicking a π-allyl cation. This discovery opens new avenues in low-valent bismuth chemistry and catalysis.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Low-valent bismuth compounds are gaining attention for their catalytic potential and unique electronic properties.
  • Understanding the fundamental electronic structures of these compounds is crucial for advancing chemical applications.

Purpose of the Study:

  • To synthesize and characterize a novel, highly reduced bismuth salt with a cationic core.
  • To investigate the electronic structure and bonding characteristics of the triatomic bismuth core.
  • To explore the utility of the synthesized complex as a synthon in organobismuth chemistry.

Main Methods:

  • Synthesis of a novel bismuth salt.
  • Characterization using structural, spectroscopic, and theoretical analyses.
  • Evaluation of its reactivity as a synthon for Bi(I) cation transfer.

Main Results:

  • Successfully synthesized and characterized a stable bismuth salt with a cationic core of three contiguous Bi(I) centers.
  • The triatomic bismuth core exhibits a π-delocalized electronic configuration analogous to a π-allyl cation.
  • The complex serves as an effective synthon for transferring Bi(I) cations to form other low-valent organobismuth compounds.
  • This represents the heaviest known stable π-allyl cation.

Conclusions:

  • The novel bismuth complex is the heaviest stable π-allyl cation, showcasing unique electronic delocalization.
  • This work expands the understanding of low-valent bismuth chemistry and its potential in catalysis.
  • The complex serves as a valuable building block for synthesizing new organobismuth compounds.