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Related Concept Videos

Nomenclature of Alkenes02:29

Nomenclature of Alkenes

The IUPAC naming system for alkenes replaces -an- with -en- in the corresponding parent alkanes. Accordingly, a simple alkene replaces the -ane suffix of the alkane with -ene.
As per the IUPAC rules, the longest carbon chain containing the maximum number of double bonds is identified as the parent chain and is numbered such that the doubly bonded carbon atoms receive the lowest possible numbers. The location of the double bond is indicated by the number of its first carbon atom. In branched...
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
Structure and Bonding of Alkenes02:47

Structure and Bonding of Alkenes

Olefins, which are unsaturated hydrocarbons containing one or more carbon–carbon double bonds, are broadly divided into alkenes and cycloalkenes. The general chemical formula of an alkene is CnH2n.
Doubly bonded carbons are sp2 hybridized and have a trigonal planar geometry. The double bond is composed of a σ bond formed by the overlap of hybrid orbitals and a π bond produced by the lateral overlap of unhybridized 2p orbitals on both the carbons. Each carbon atom is bonded to two hydrogen atoms...
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...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

The longest polyene.

Muhammad Zeeshan1, Hans-Richard Sliwka, Vassilia Partali

  • 1Department of Chemistry, Norwegian University of Science and Technology, Trondheim, Norway.

Organic Letters
|October 18, 2012
PubMed
Summary
This summary is machine-generated.

Researchers synthesized the longest polyene molecule to date, featuring 27 conjugated double bonds. This stable and soluble polyene marks a significant advancement toward achieving the ultimate absorption maximum (λmax).

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Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Polyenes are organic molecules with alternating single and double bonds.
  • Longer polyenes exhibit unique optical and electronic properties.
  • Synthesizing very long polyenes presents significant challenges.

Purpose of the Study:

  • To synthesize a novel, exceptionally long polyene molecule.
  • To achieve a new record for the longest conjugated polyene.
  • To explore the synthesis of stable and soluble polyenes for potential applications.

Main Methods:

  • Utilized microwave-assisted Wittig reaction for efficient synthesis.
  • Focused on achieving high yields in the polyene synthesis process.

Main Results:

  • Successfully synthesized a polyene with 27 conjugated double bonds, the longest recorded to date.
  • The synthesized polyene demonstrated good solubility and stability.
  • This represents a significant step towards achieving the ultimate absorption maximum (λmax).

Conclusions:

  • Microwave-assisted Wittig reaction is effective for synthesizing long-chain polyenes.
  • The new polyene is a stable, well-soluble compound with potential for further research.
  • This work advances the field of polyene synthesis and optical materials.