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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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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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Olefin Metathesis Polymerization: Overview01:13

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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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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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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.
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Solid-state polymerization in a polyrotaxane coordination polymer via a [2+2] cycloaddition reaction.

In-Hyeok Park1, Raghavender Medishetty, Shim Sung Lee

  • 1Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, South Korea. sslee@gnu.ac.kr.

Chemical Communications (Cambridge, England)
|May 15, 2014
PubMed
Summary
This summary is machine-generated.

Alternate bpeb ligands in a 2D coordination polymer selectively polymerized via a [2+2] cycloaddition reaction. This transformation yielded a novel polyrotaxane-based 3D structure in a single-crystal-to-single-crystal manner.

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Area of Science:

  • Materials Science
  • Crystallography
  • Polymer Chemistry

Background:

  • Coordination polymers offer tunable structures with diverse applications.
  • Polyrotaxanes represent complex molecular architectures with unique topological properties.
  • Single-crystal-to-single-crystal transformations are crucial for controlled structural modification.

Purpose of the Study:

  • To investigate the selective polymerization of alternate bpeb ligands within a 2D coordination polymer.
  • To explore the formation of a 3D polyrotaxane-based structure through a [2+2] cycloaddition reaction.
  • To demonstrate the feasibility of single-crystal-to-single-crystal transformations in creating complex polymer architectures.

Main Methods:

  • Synthesis of the 2D coordination polymer [Cd(bpeb)(sdb)]·DMA (1).
  • Induction of selective [2+2] cycloaddition polymerization of bpeb ligands.
  • Characterization of the resulting 3D polyrotaxane-based structure [Cd(bpeb)0.5(poly-bppcb)0.5(sdb)]·DMA (2) using single-crystal X-ray diffraction.

Main Results:

  • The alternate bpeb ligands within the 2D coordination polymer selectively underwent polymerization.
  • A novel polyrotaxane-based 3D structure was successfully formed via a [2+2] cycloaddition reaction.
  • The transformation occurred in a single-crystal-to-single-crystal manner, preserving crystallinity.

Conclusions:

  • Selective ligand polymerization within coordination polymers can lead to the formation of complex 3D architectures.
  • Single-crystal-to-single-crystal transformations are effective for constructing polyrotaxane-based materials.
  • This study showcases a pathway to novel 3D polymer structures from 2D precursors.