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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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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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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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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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[2]Catenane Synthesis via Covalent Templating.

Simone Pilon1, Steen Ingemann Jørgensen1, Jan H van Maarseveen1

  • 1Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 17, 2020
PubMed
Summary
This summary is machine-generated.

This study demonstrates covalent templating to synthesize mechanically interlocked molecules (MiMs) without recognition sites. Researchers created a [2]catenane through sequential macrocyclization and linkage cleavage, advancing complex molecule synthesis.

Keywords:
catenanescovalent templatemechanically interlocked moleculesplanar chiralitytemplate synthesis

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Mechanically Interlocked Molecules (MiMs) are complex architectures with unique properties.
  • Previous synthesis of MiMs often relied on supramolecular recognition sites, limiting design flexibility.
  • Developing new templating strategies is crucial for accessing diverse MiM structures.

Purpose of the Study:

  • To report a novel covalent templating strategy for synthesizing MiMs.
  • To create MiMs that lack traditional supramolecular recognition sites.
  • To demonstrate the formation of a [2]catenane using this method.

Main Methods:

  • Utilized covalent templating with temporary benzylic linkages.
  • Employed sequential macrocyclization reactions.
  • Incorporated a central ketal linkage for controlled assembly.
  • Cleaved temporary and linking bonds to yield the final product.

Main Results:

  • Successfully synthesized mechanically interlocked molecules (MiMs) using covalent templating.
  • Achieved perpendicular covalent connection of two linear strands.
  • Formed a pseudo[1]rotaxane intermediate.
  • Converted the intermediate to a [2]catenane via a second macrocyclization and cleavage steps.

Conclusions:

  • Covalent templating is a viable strategy for synthesizing MiMs lacking supramolecular recognition sites.
  • The developed method allows for controlled formation of complex interlocked architectures.
  • This work expands the synthetic toolbox for creating novel mechanically interlocked molecules.