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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is confirmed through isotopic...
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Electrophilic Aromatic Substitution: Sulfonation of Benzene

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In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...

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(E)-4-(Benz-yloxy)benzaldehyde thio-semicarbazone.

M T H Tarafder, M A A A A Islam, K A Crouse

    Acta Crystallographica. Section E, Structure Reports Online
    |January 5, 2011
    PubMed
    Summary

    This study details the crystal structure of a benzaldehyde thiosemicarbazone derivative. The compound exhibits an E configuration and forms a 2D network via hydrogen bonding and pi-pi interactions.

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    Area of Science:

    • Crystallography
    • Organic Chemistry
    • Supramolecular Chemistry

    Background:

    • Thiosemicarbazones are versatile organic compounds with diverse applications.
    • Understanding the solid-state structure of organic molecules is crucial for predicting their properties and reactivity.

    Purpose of the Study:

    • To elucidate the crystal structure of a specific benzaldehyde thiosemicarbazone derivative.
    • To investigate the intermolecular interactions governing the crystal packing.

    Main Methods:

    • Single-crystal X-ray diffraction analysis was employed.
    • Structural parameters, including bond lengths, angles, and dihedral angles, were determined.
    • Intermolecular interactions such as hydrogen bonding and pi-pi stacking were analyzed.

    Main Results:

    • The compound C(15)H(15)N(3)OS crystallizes with the thiosemicarbazone group in an E configuration.
    • The benzaldehyde thiosemicarbazone fragment is nearly planar, with a dihedral angle of 72.48° between the benz-yloxy and phenyl rings.
    • The crystal structure features a 2D network formed by N-H⋯N and N-H⋯S hydrogen bonds, with additional stabilization from π-π and C-H⋯π interactions.

    Conclusions:

    • The detailed crystal structure provides insights into the molecular conformation and intermolecular forces.
    • The observed hydrogen bonding and π-π stacking interactions dictate the supramolecular architecture.
    • This structural information is valuable for the design and development of related compounds.