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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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the...
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Manipulating Aromaticity to Redirect Topochemical Polymerization Pathways.

Qingsong Zhang1, Zhipeng Pei2, Ah-Young Song3

  • 1The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|April 15, 2025
PubMed
Summary
This summary is machine-generated.

Researchers controlled topochemical polymerization (TCP) by altering aromaticity in para-azaquinodimethane (AQM) systems. Modifying terminal groups with furyl units enabled new polymer structures via spin-density-driven coupling reactions.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Topochemical polymerization (TCP) is crucial for synthesizing regio- and stereoregular polymers via solid-state reactions.
  • Controlling polymerization pathways in solid-state transformations remains a significant challenge in polymer science.
  • Aromaticity plays a key role in the reactivity and electronic properties of organic molecules.

Purpose of the Study:

  • To develop an innovative strategy for controlling topochemical polymerization pathways.
  • To investigate the effect of terminal group aromaticity on polymerization reactivity.
  • To synthesize novel polymers with unique main-chain structures.

Main Methods:

  • Tailoring terminal group aromaticity in para-azaquinodimethane (AQM) ring systems by substituting phenyl groups with furyl units.
  • Thermal activation to induce spin density delocalization and diradicaloid character.
  • Solution and solid-state reaction monitoring, X-ray crystallography, theoretical modeling, and isotopic labeling experiments.

Main Results:

  • Thermal treatment in toluene yielded a unique cyclophane dimer via furyl-methine C-C coupling.
  • Solid-state reactions produced polymers through intercolumnar furyl-methine and intracolumnar methine-methine coupling.
  • Aromaticity modulation successfully controlled polymerization pathways and enabled synthesis of previously inaccessible polymer structures.

Conclusions:

  • Modulating aromaticity in pro-aromatic systems offers a powerful method to control topochemical polymerization.
  • The spin-center-directed mechanism governs the observed coupling reactions.
  • This approach provides access to polymers with complex main-chain architectures.