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Related Concept Videos

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...
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,...
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.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

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.
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,...
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...

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Daisy chain assembly formed from a cucurbit[6]uril derivative.

Liping Cao1, Lyle Isaacs

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.

Organic Letters
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Researchers synthesized a novel cyclodextrin derivative and demonstrated its self-assembly into a cyclic daisy chain structure in water. This assembly showed responsive behavior to guests and receptors.

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Cyclodextrins (CBs) are versatile macrocycles with applications in host-guest chemistry.
  • Developing novel CB derivatives enables new supramolecular architectures.
  • Click chemistry offers efficient functionalization of molecular building blocks.

Purpose of the Study:

  • To synthesize a functionalized cyclodextrin derivative (CB[6]) with a propargyloxy group.
  • To create a cyclic [c2] daisy chain assembly (1(2)) via self-assembly in water.
  • To investigate the responsive behavior of the 1(2) assembly to external stimuli.

Main Methods:

  • Synthesis of a CB[6] derivative bearing a propargyloxy group.
  • Functionalization using click chemistry to introduce an isobutylammonium group, yielding compound 1.
  • Characterization of compound 1 and its self-assembly into 1(2) in aqueous solution.
  • Stimuli-responsive studies using guests and CB[n] receptors.

Main Results:

  • Successful synthesis of the propargyloxy-functionalized CB[6] derivative.
  • Formation of a stable cyclic [c2] daisy chain assembly (1(2)) from compound 1 in water.
  • Demonstration of stimuli-responsive behavior of the 1(2) assembly.

Conclusions:

  • A novel CB[6] derivative was synthesized and functionalized using click chemistry.
  • The derivative self-assembles into a cyclic daisy chain structure in water.
  • The assembly exhibits tunable behavior in response to guests and receptors, highlighting its potential in supramolecular chemistry.