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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

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Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.6K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.6K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
3.6K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

12.7K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Updated: Feb 22, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Two-Dimensional Conjugated Polymers Based on C-C Coupling.

Wei Liu1,2,3, Kian Ping Loh1,2

  • 1Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543, Singapore.

Accounts of Chemical Research
|September 26, 2017
PubMed
Summary
This summary is machine-generated.

Synthesizing crystalline two-dimensional polymers using C-C bonds is a major goal in chemistry. Researchers are exploring interface-confined or sterically constrained polymerization methods to achieve this challenging synthesis.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Crystallography

Background:

  • Crystalline two-dimensional (2D) polymers represent a significant frontier in synthetic chemistry.
  • Achieving polymers with C-C covalent linkages in a 2D crystalline structure is highly desirable but remains a challenge.

Purpose of the Study:

  • To explore potential synthetic strategies for creating crystalline 2D polymers linked by C-C bonds.
  • To identify viable routes for achieving this long-sought goal in polymer synthesis.

Main Methods:

  • Investigating interface-confined polymerization techniques, such as at air-water interfaces.
  • Considering solid-solid interface polymerization approaches.
  • Exploring sterically constrained polymerization of prepacked crystalline monomers.

Main Results:

  • The abstract outlines theoretical approaches rather than experimental results.
  • Identified interface-confined polymerization and sterically constrained polymerization as key potential strategies.

Conclusions:

  • The synthesis of crystalline 2D polymers with C-C bonds is a 'holy grail' of synthetic chemistry.
  • Interface-confined and sterically constrained polymerization offer promising avenues for future research.