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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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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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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: 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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[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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Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

4.0K
The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
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Limitations of Friedel–Crafts Reactions01:26

Limitations of Friedel–Crafts Reactions

5.1K
Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
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Recent advances in controllable/divergent synthesis.

Jilei Cao1, Leiyang Bai1, Xuefeng Jiang1,2,3

  • 1Hainan Institute of East China Normal University, State Key Laboratory of Petroleum Molecular & Process Engineering, Shanghai Key Laboratory of Green Chemistry and Chemical Process, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, PR China.

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This review explores controllable divergent synthesis for creating diverse organic molecules efficiently. Key factors like ligands, catalysts, and solvents control product formation, advancing chemical synthesis applications.

Keywords:
controllabledivergentdiverse productsswitchable synthesis

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Area of Science:

  • Organic Synthesis
  • Catalysis
  • Materials Science

Background:

  • Streamlined synthesis of diverse organic molecules is crucial for pharmaceuticals and materials.
  • Controllable/divergent synthetic strategies offer high efficiency using common starting materials.

Purpose of the Study:

  • To review recent literature on controllable divergent synthesis.
  • To identify key regulatory factors influencing product formation.
  • To analyze reaction mechanisms for improved selectivity.

Main Methods:

  • Categorization of recent literature on divergent synthesis.
  • Analysis of regulatory factors: ligands, catalysts, solvents, temperature, pH, and substrate modification.
  • Systematic mechanistic analysis of critical reaction steps via case studies.

Main Results:

  • Divergent synthesis control relies on precise manipulation of reaction parameters.
  • Ligands, metal catalysts, solvents, and substrate features are key selectivity determinants.
  • Mechanistic insights reveal pathways for controlling reaction outcomes.

Conclusions:

  • Controllable divergent synthesis offers a powerful platform for generating molecular diversity.
  • Understanding regulatory factors is essential for optimizing synthetic routes.
  • This approach holds significant potential for innovation in organic chemistry and related fields.