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Related Concept Videos

E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only in the...
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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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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
E2 Reaction: Kinetics and Mechanism02:45

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SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
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An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.
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(E)-1-[1-(3-Chloro-phen-yl)ethyl-idene]-2-(2,4-dinitro-phen-yl)hydrazine.

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    Acta Crystallographica. Section E, Structure Reports Online
    |March 14, 2012
    PubMed
    Summary
    This summary is machine-generated.

    This study details the crystal structure of a C14H11ClN4O4 compound, revealing two independent molecules with planar structures and intramolecular hydrogen bonds. Crystal packing involves sheets formed by weak interactions and stacked via pi-pi interactions.

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    Published on: June 20, 2014

    Area of Science:

    • Crystallography
    • Chemical Physics
    • Materials Science

    Background:

    • Understanding the solid-state structure of organic compounds is crucial for predicting their physical and chemical properties.
    • The presence of nitro groups and aromatic rings suggests potential applications in energetic materials or as intermediates in organic synthesis.

    Purpose of the Study:

    • To elucidate the crystal structure of the title compound, C14H11ClN4O4.
    • To analyze the molecular conformation, intermolecular interactions, and crystal packing of the compound.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the crystal structure.
    • Analysis of molecular geometry, including bond lengths, bond angles, and dihedral angles.
    • Identification and analysis of intermolecular interactions such as hydrogen bonds and pi-pi stacking.

    Main Results:

    • Two crystallographically independent molecules were identified in the asymmetric unit, both exhibiting an E conformation around the C=N double bond.
    • Molecules are nearly planar, with small dihedral angles between benzene rings (10.24(12)° and 4.73(12)°).
    • Intramolecular N-H⋯O hydrogen bonds form S(6) ring motifs, and crystal packing is characterized by sheets linked by C-H⋯O interactions and stacked by π-π interactions.

    Conclusions:

    • The crystal structure of C14H11ClN4O4 has been determined, revealing detailed molecular arrangements and interactions.
    • The observed packing motifs, including hydrogen bonding and π-π stacking, influence the solid-state properties of the compound.
    • A significant Cl⋯O short contact was noted, potentially influencing intermolecular forces within the crystal lattice.