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Related Concept Videos

Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.5K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
3.5K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.5K
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.
2.5K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.0K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.0K
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

7.8K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
7.8K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K
Reaction Mechanisms03:06

Reaction Mechanisms

25.3K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
25.3K

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Cu(OTf)2-catalyzed multicomponent reactions.

Sara Colombo1, Camilla Loro1, Egle M Beccalli2

  • 1Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell'Insubria, Via Valleggio 9, 22100, Como, Italy.

Beilstein Journal of Organic Chemistry
|January 21, 2025
PubMed
Summary
This summary is machine-generated.

Copper(II) triflate catalyzes multicomponent reactions for synthesizing acyclic and cyclic compounds efficiently. This review highlights advancements in atom- and step-economical strategies for creating complex molecules.

Keywords:
cascade processcopper catalysisheteropolycyclesmulticomponent reactionsone-pot reaction

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Chemistry

Background:

  • Multicomponent reactions (MCRs) offer efficient synthetic routes.
  • Copper(II) triflate is a versatile catalyst in organic synthesis.
  • Developing atom- and step-economical methods is crucial for sustainable chemistry.

Purpose of the Study:

  • To review the achievements of copper(II) triflate-catalyzed multicomponent reactions.
  • To explore the synthesis of acyclic and cyclic compounds using these methods.
  • To provide mechanistic insights for heteropolycyclic systems.

Main Methods:

  • Literature review of copper(II) triflate-catalyzed processes.
  • Focus on multicomponent reactions including cycloaddition and aza-Diels-Alder reactions.
  • Analysis of mechanistic pathways for heteropolycyclic compound synthesis.

Main Results:

  • Copper(II) triflate effectively catalyzes various multicomponent reactions.
  • Successful synthesis of diverse acyclic and cyclic compounds reported.
  • Mechanistic insights provided for key transformations, including cycloadditions.

Conclusions:

  • Copper(II) triflate-catalyzed MCRs are powerful tools for efficient synthesis.
  • These methods offer high atom and step economy.
  • The strategies are characterized by mild conditions, low cost, and ease of handling.