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Related Concept Videos

Multi-Step Reactions02:31

Multi-Step Reactions

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. Each of the steps in a reaction mechanism is called an elementary reaction. These...
Reaction Mechanisms03:06

Reaction Mechanisms

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:
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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.
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Chemical Reactions01:19

Chemical Reactions

A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them into different...
Chemical Reactions02:26

Chemical Reactions

A balanced chemical equation provides the information of chemical formulas of the reactants and products involved in the chemical change. A reaction’s stoichiometry helps predict how much of the reactant is needed to produce the desired amount of product, or in some cases, how much product will be formed from a specific amount of the reactant.
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in...

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
07:36

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

Higher-order multicomponent reactions: beyond four reactants.

Sebastian Brauch1, Sander S van Berkel, Bernhard Westermann

  • 1Leibniz-Institute of Plant Biochemistry, Dept. of Bioorganic Chemistry, Weinberg 3, 06120 Halle (Saale), Germany.

Chemical Society Reviews
|February 22, 2013
PubMed
Summary
This summary is machine-generated.

Multicomponent reactions (MCRs) create complex molecules efficiently. This review highlights recent advances in "higher-order" MCRs, combining five or more components, which are crucial for drug discovery and natural product synthesis.

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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions
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Optimization of the Ugi Reaction Using Parallel Synthesis and Automated Liquid Handling
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Last Updated: May 14, 2026

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
07:36

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions

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Optimization of the Ugi Reaction Using Parallel Synthesis and Automated Liquid Handling
08:24

Optimization of the Ugi Reaction Using Parallel Synthesis and Automated Liquid Handling

Published on: November 11, 2008

Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Medicinal Chemistry

Background:

  • Multicomponent reactions (MCRs) are powerful tools for generating molecular diversity and complexity in a single step.
  • Their application is vital for exploring chemical space in the search for pharmacologically active compounds.
  • While three- and four-component MCRs are well-established, higher-order MCRs (five or more components) remain less explored.

Purpose of the Study:

  • To critically review recent advancements in higher-order multicomponent reactions.
  • To outline the key ideas, challenges, and landmark reactions in this developing field.
  • To provide insights into the progress and future directions of MCRs with increased component numbers.

Main Methods:

  • Literature review of recent developments in multicomponent reactions.
  • Analysis of strategies and challenges in designing and executing higher-order MCRs.
  • Identification and discussion of significant milestone reactions in the field.

Main Results:

  • Significant progress has been made in developing novel higher-order MCRs.
  • Key challenges in controlling selectivity and optimizing conditions for complex MCRs have been addressed.
  • Several milestone reactions demonstrating the feasibility of combining five or more components have emerged.

Conclusions:

  • Higher-order MCRs offer immense potential for rapid access to complex molecular architectures.
  • Continued research in this area is essential for expanding the utility of MCRs in synthesis and drug discovery.
  • The field is poised for further innovation, enabling the creation of unprecedented molecular complexity.