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Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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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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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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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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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Template-Directed Synthesis and Isolation of Unimolecular Oligo[n]catenanes Using a One-Pot CuAAC "Click" Reaction

Sheila L Tran1, Gray H Harlan1, David E Puckowitz1

  • 1Department of Chemistry, Washington University in St. Louis, One Brookings Drive, St. Louis, Missouri, 63130, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 6, 2025
PubMed
Summary

Chemists developed a one-pot synthesis for mechanically interlocked molecules called catenanes. This efficient method uses copper(I) templation and click chemistry to create complex molecular architectures.

Keywords:
catenanesclick chemistrymetal templationoligocatenaneself‐assembly

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Mechanically interlocked molecules (MIMs), particularly catenanes, are of significant interest due to their unique properties and potential applications.
  • Traditional synthesis of unimolecular [n]catenanes often involves low yields and laborious multi-step procedures.
  • Developing efficient and scalable synthetic routes for catenanes is a key challenge in the field.

Purpose of the Study:

  • To develop an efficient, one-pot synthetic strategy for unimolecular [n]catenanes.
  • To overcome the limitations of traditional multistep synthesis methods for catenanes.
  • To explore kinetic control in catenane synthesis for potential higher-order structures.

Main Methods:

  • A template-directed one-pot approach utilizing copper(I)-based templation and copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) 'click' chemistry.
  • Employing simple, symmetrical phenanthroline-based building blocks.
  • Controlling the rate of addition of alkyne- and azide-functionalized precursors to influence product distribution.

Main Results:

  • Successful synthesis of a series of unimolecular [n]catenanes in a single pot.
  • Achieved a high yield of 82% for a [2]catenane when precursors were added all at once.
  • Obtained a batch of well-defined linear [2]-[5]catenanes (and trace [6]catenane) in 18% overall yield with slow precursor addition.

Conclusions:

  • The developed one-pot method provides an efficient alternative to multistep syntheses for catenanes.
  • Kinetic control over precursor addition allows for selective synthesis of different catenane orders.
  • This methodology offers a promising pathway for preparing higher-order catenanes and related complex architectures.