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

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

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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.
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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.
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...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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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...
2.7K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

3.9K
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
3.9K
Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

3.5K
Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Ultramicroporous Polyphenylenes via Diels-Alder Polycondensation Approach.

Svetlana A Sorokina1, Nina V Kuchkina1, Alexander V Mikhalchenko1

  • 1A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., 119991 Moscow, Russia.

Polymers
|May 13, 2023
PubMed
Summary

Researchers developed new soluble microporous organic polymers using Diels-Alder polycondensation. These materials offer tunable porosity and high surface areas for diverse applications.

Keywords:
Diels–Alder reactionmicroporous non-network polymerspolyphenylenesporous organic polymers (POPs)solution processability

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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Microporous organic polymers (MOPs) are highly sought after for various applications.
  • Synthesizing soluble MOPs with high surface area and uniform microporosity remains a significant challenge.
  • Existing methods for creating soluble MOPs are limited.

Purpose of the Study:

  • To introduce a novel approach for constructing soluble, porous polyphenylenes.
  • To investigate the synthesis and characterization of these new MOPs.
  • To explore the tunability of porosity parameters in the synthesized polymers.

Main Methods:

  • Employed Diels-Alder polycondensation of multifunctional ethynyl-containing monomers with bis(cyclopentadienone)s.
  • Characterized the resulting polymers using Nuclear Magnetic Resonance (NMR), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), and Size Exclusion Chromatography (SEC).
  • Analyzed porosity using N2 and CO2 adsorption-desorption isotherms.

Main Results:

  • Successfully synthesized soluble, non-crosslinking porous polyphenylenes.
  • Achieved specific surface areas up to 751 m²·g⁻¹ with an ultramicroporous structure (pore size ≤ 0.6 nm).
  • Demonstrated selective tunability of porosity parameters (surface area, pore size) by adjusting monomers and reaction conditions.

Conclusions:

  • A new, effective method for creating soluble, porous polyphenylenes has been established.
  • The synthesized polymers exhibit promising properties for applications requiring controlled porosity.
  • The study highlights the potential for tailoring polymer architecture and synthesis for specific porosity characteristics.