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Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles01:11

Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles

Naming Amides
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.

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Deacetyl-nomilin monohydrate.

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    Acta Crystallographica. Section E, Structure Reports Online
    |November 9, 2011
    PubMed
    Summary
    This summary is machine-generated.

    This study details the crystal structure of 1-hydroxy-1,2-dihydro-obacunoic acid 3,4-lactone monohydrate. Analysis reveals specific dihedral angles and trans-fused ring junctions, forming a unique three-dimensional structure via hydrogen bonding.

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    Area of Science:

    • Crystallography
    • Organic Chemistry
    • Structural Chemistry

    Background:

    • Obacunoic acid derivatives are natural products with potential bioactivity.
    • Understanding the precise three-dimensional structure is crucial for structure-activity relationship studies.

    Purpose of the Study:

    • To elucidate the crystal structure of 1-hydroxy-1,2-dihydro-obacunoic acid 3,4-lactone monohydrate.
    • To characterize the molecular geometry and intermolecular interactions.

    Main Methods:

    • Single-crystal X-ray diffraction analysis was performed.
    • The crystal structure was solved and refined.

    Main Results:

    • The compound crystallizes as a monohydrate with the chemical formula C(26)H(32)O(8)·H(2)O.
    • Key dihedral angles between ester, furan, and keto groups were determined.
    • The A/B, B/C, and C/D ring junctions were confirmed to be trans-fused.
    • Intermolecular hydrogen bonds involving hydroxyl, carbonyl, and water molecules were observed, dictating the 3D structure.

    Conclusions:

    • The detailed structural analysis provides a foundation for understanding the chemical properties and potential biological activities of this obacunoic acid derivative.
    • The observed hydrogen bonding network highlights the role of water in stabilizing the crystal lattice.