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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
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Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Azaborine benzylic ion stability and reactivity in ionic polymerization.

Herbert Wakefield Iv1, Qifeng Jiang1, Rebekka S Klausen1

  • 1Johns Hopkins University - Chemistry, 3400 N. Charles St, Baltimore 21218, USA. klausen@jhu.edu.

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This summary is machine-generated.

Boron-nitrogen (BN) substitution in organic molecules influences benzylic ion reactivity and polymerization. BN-containing naphthalenes undergo nucleophilic aromatic substitution, offering new design principles for main group chemistry.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Organometallic Chemistry

Background:

  • Benzylic cations and anions are key intermediates in organic reactions like styrene polymerization.
  • Boron-nitrogen (BN) substitution is explored for its impact on chemical reactivity.

Purpose of the Study:

  • To investigate how BN substitution affects benzylic ion stability and reactivity.
  • To examine the influence of BN on the ionic polymerization of 2-vinylnaphthalene (BN2VN).

Main Methods:

  • Computational calculations were used to model the electronic properties and stability of BN-substituted benzylic ions.
  • Reactions involving organolithium reagents and BN-substituted naphthalenes were studied to understand substitution mechanisms.

Main Results:

  • The proximity of a nitrogen donor to a cation stabilizes BN benzylic cations, explaining the lack of protonation in BN2VN.
  • BN2VN and related BN naphthalenes undergo facile nucleophilic aromatic substitution with organolithium reagents via an associative mechanism.

Conclusions:

  • BN substitution significantly alters the stability and reactivity of benzylic ions.
  • These findings provide design principles for developing new main group aromatic substitution reactions and materials.