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Radical Halogenation: Stereochemistry01:33

Radical Halogenation: Stereochemistry

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Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
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Radicals: Electronic Structure and Geometry01:07

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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
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Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Radical Reactivity: Steric Effects01:10

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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
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Asymmetric and zwitterionic Blatter diradicals.

Fang Miao1,2, Yu Ji1,3, Bo Han4

  • 1Department of Pharmacy, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China Chengdu 610072 People's Republic of China zhengyonghao@uestc.edu.cn.

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Summary
This summary is machine-generated.

This study explores novel asymmetric diradical molecules, revealing unique resonance mechanisms and electronic structures. The findings offer insights into the delicate balance governing open-shell molecular systems.

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Area of Science:

  • Organic Chemistry
  • Molecular Physics
  • Computational Chemistry

Background:

  • Asymmetric diradical molecular systems and their resonance mechanisms are underexplored.
  • Understanding these systems is crucial for developing novel molecular materials.

Purpose of the Study:

  • To synthesize and characterize two novel conjugated asymmetric diradicals, pBP and mBP, incorporating Blatter and phenoxyl moieties.
  • To elucidate the distinct resonance mechanisms and electronic structures of these isomers.
  • To investigate the factors influencing diradical character and singlet-triplet gaps.

Main Methods:

  • Synthesis of para- and meta-isomers (pBP and mBP).
  • Spectroscopic, X-ray crystallographic, and magnetic characterization techniques.
  • Quantum chemical calculations for electronic structure analysis.

Main Results:

  • The para-isomer (pBP) exhibits synergistic integration of diradical and zwitterionic resonant forms via nitrogen atoms.
  • The meta-isomer (mBP) displays a pseudo-hyperconjugation effect involving nitrogen lone pairs.
  • Both isomers demonstrate medium diradical characters and narrow singlet-triplet gaps due to these electronic effects.

Conclusions:

  • The study highlights the subtle electronic balance in asymmetric diradical systems.
  • Novel resonance mechanisms in phenoxyl-Blatter diradicals are identified.
  • These findings advance the understanding of open-shell molecular electronic structures.