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Related Concept Videos

Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.1K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Consecutive Reactions01:22

Consecutive Reactions

42
Consecutive reactions involve a sequence where the product of a preceding reaction becomes the reactant for the subsequent one. In a simple scheme, A transforms into B, which further reacts to form C, with rate constants k1 and k2, respectively. This concept is evident in the radioactive decay series. Assuming an initial state with only A present, the conservation of matter leads to three coupled differential equations, determining the concentrations of A, B, and C over time.The rate of change...
42

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Updated: Mar 12, 2026

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks
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Cycle-Sequencing Reactions.

Elaine Mardis, W Richard McCombie

    Cold Spring Harbor Protocols
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    Summary
    This summary is machine-generated.

    Capillary DNA sequencing is a versatile molecular biology tool for verifying clones and validating genetic variants. This method uses the ABI3730xl sequencer for reliable DNA analysis.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biotechnology

    Background:

    • Capillary sequencing is a fundamental technique in molecular biology.
    • It is widely used for clone verification and variant validation.

    Purpose of the Study:

    • To highlight the utility and methods of capillary sequencing.
    • To describe its application in conjunction with next-generation sequencing.

    Main Methods:

    • Utilizes the ABI3730xl capillary sequencer for cycle sequencing.
    • Employs template preparation from plasmid minipreps for direct sequencing.
    • Sequences amplified products using specific primers for LongAmp amplification reactions.

    Main Results:

    • Demonstrates the versatility of capillary sequencing for various applications.
    • Shows successful application in identifying mutations and validating genetic structures.
    • Confirms the reliability of targeted primer design for sequencing.

    Conclusions:

    • Capillary sequencing remains an indispensable tool for molecular biologists.
    • The ABI3730xl platform offers robust capabilities for DNA analysis.
    • Specific primer design enhances the accuracy of clone verification and variant validation.