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Related Concept Videos

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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 acceptor.
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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 generated carbocation,...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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 catalyst, high molecular...

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Related Experiment Video

Updated: Jun 30, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Metallacarboranes as building blocks for polyanionic polyarmed aryl-ether materials.

Pau Farràs1, Francesc Teixidor, Raikko Kivekäs

  • 1Institut de Ciencia de Materials de Barcelona (CSIC), Campus de la U.A.B., E-08193 Bellaterra, Spain.

Inorganic Chemistry
|September 23, 2008
PubMed
Summary
This summary is machine-generated.

A new method synthesizes polyanionic species using ring-opening reactions. These novel boron neutron capture therapy compounds show enhanced water solubility and potential for dendrimer construction.

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Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles
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Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles

Published on: June 14, 2024

Area of Science:

  • Organometallic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Cyclic oxonium compounds serve as precursors for novel polyanionic species.
  • Metallacarborane clusters offer unique structural and electronic properties.
  • Boron neutron capture therapy (BNCT) requires compounds with high water solubility and tumor-targeting capabilities.

Purpose of the Study:

  • To develop a new synthetic route for polyanionic species.
  • To characterize the structure and bonding of novel polyanionic compounds.
  • To explore potential applications in BNCT and dendrimer synthesis.

Main Methods:

  • Ring-opening reactions of cyclic oxonium using various nucleophiles (carboxylic acids, Grignard reagents, thiocarboranes).
  • X-ray crystallography for determining the solid-state structures of synthesized compounds.
  • Dynamic Nuclear Magnetic Resonance (NMR) studies for solution-state structural confirmation.

Main Results:

  • High yields of polyanionic species achieved through the novel synthetic route.
  • Crystal structures reveal coordination of oxygen atoms to Na(+) and B-H...Na interactions.
  • Dynamic NMR studies confirm B-H...Na interactions in solution, indicating structural stability.

Conclusions:

  • The new synthetic route provides access to valuable polyanionic compounds with multiple carborane/metallacarborane clusters.
  • These compounds exhibit enhanced water solubility, making them promising candidates for BNCT.
  • The structures serve as a foundation for developing new dendrimers with potential applications in medicine and materials science.