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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 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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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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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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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Carbocations

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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 Versatile Method for the End-Functionalization of Polycarbenes.

Li Zhou1, Run-Tan Gao1, Xin-Jie Zhang1

  • 1Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Department of Polymer Science and Engineering, Hefei University of Technology, Hefei, Anhui Province, 230009, China.

Macromolecular Rapid Communications
|November 18, 2021
PubMed
Summary
This summary is machine-generated.

A new method enables end-functionalization of helical polycarbenes using Sonogashira coupling. This technique allows precise introduction of functional groups and creation of hybrid block copolymers for advanced polymer materials.

Keywords:
end-functionalizationfunctional materialspolycarbenesonogashira coupling reaction

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • End-functionalization is crucial for creating advanced polymer materials.
  • Helical polycarbenes offer unique structural properties for material applications.
  • Controlled synthesis of polymers with specific end-group functionalities remains a challenge.

Purpose of the Study:

  • To develop a robust method for the chain-end functionalization of helical polycarbenes.
  • To introduce diverse functional groups, including fluorine, aldehyde, and anthracene, onto polycarbene chains.
  • To synthesize hybrid block copolymers and investigate their self-assembly behavior.

Main Methods:

  • Preparation of helical polycarbenes with controlled molecular mass and low polydispersity using a Pd(II)/Wei-Phos initiator system.
  • Utilizing Sonogashira coupling reaction catalyzed by the end-bound Pd(II) complex to attach terminal alkyne derivatives.
  • Characterization of polymer structures using various spectroscopic techniques (1H NMR, 19F NMR, 31P NMR, FT-IR).
  • Investigation of self-assembly properties of hybrid block copolymers via atomic force microscopy.

Main Results:

  • A facile and effective method for chain-end functionalization of helical polycarbenes was established.
  • Various functional groups were successfully installed at the polycarbene chain ends.
  • Hybrid block copolymers were synthesized, demonstrating potential for tailored material properties.
  • Transition metal residues at the polymer chain ends could be effectively removed.

Conclusions:

  • The developed Sonogashira coupling-based method provides versatile access to end-functionalized helical polycarbenes.
  • This approach facilitates the construction of novel functional polymer materials and hybrid block copolymers.
  • The method offers precise control over polymer architecture and end-group modification, enabling diverse applications.