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Related Concept Videos

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:29

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
Alkyl Halides02:45

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Indirect-Acting Cholinergic Agonists: Pharmacological Actions01:30

Indirect-Acting Cholinergic Agonists: Pharmacological Actions

Indirect-acting cholinergic agonists, also known as anticholinesterases, exert their pharmacological effects by enhancing cholinergic transmission in various body parts, including the neuromuscular junction, autonomic cholinergic synapses, and the brain.
At the neuromuscular junction, these agents work by inhibiting the breakdown of acetylcholine, allowing it to remain bound to the receptor and bind to nearby receptors. This process leads to repetitive firing of the endplate, causing muscle...
Halogenation of Alkenes02:46

Halogenation of Alkenes

Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

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Related Experiment Video

Updated: Jun 1, 2026

A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones
07:30

A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones

Published on: January 21, 2020

5-Chloro-indoline-2,3-dione.

Wen-Bin Wei, Shuo Tian, Hao Zhou

    Acta Crystallographica. Section E, Structure Reports Online
    |May 19, 2011
    PubMed
    Summary

    This study details the crystal structure of a novel compound, C(8)H(4)ClNO(2). Molecular analysis reveals an almost planar structure stabilized by hydrogen bonds, forming linked chains in the crystal lattice.

    Area of Science:

    • Crystallography
    • Solid-state chemistry

    Background:

    • Understanding molecular interactions in the solid state is crucial for materials science.
    • Crystal engineering relies on predicting and controlling intermolecular forces.

    Purpose of the Study:

    • To elucidate the crystal structure and intermolecular interactions of the title compound, C(8)H(4)ClNO(2).
    • To characterize the hydrogen bonding network and its influence on crystal packing.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
    • Analysis of non-covalent interactions, including hydrogen bonds (N-H⋯O) and C-H⋯O interactions, was performed.

    Main Results:

    • The title compound, C(8)H(4)ClNO(2), exhibits an almost planar molecular geometry (r.m.s. deviation for non-H atoms = 0.023 Å).

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    Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
    14:11

    Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

    Published on: June 10, 2021

  • Molecules are organized into C(4) chains via N-H⋯O hydrogen bonds propagating along the [001] direction.
  • C-H⋯O interactions further cross-link these chains, contributing to the overall crystal architecture.

    • Conclusions:

    • The crystal structure is stabilized by a combination of N-H⋯O and C-H⋯O hydrogen bonding interactions.
    • The observed packing arrangement dictates the compound's solid-state properties and potential applications.