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Related Concept Videos

Experimental Determination of Chemical Formula02:37

Experimental Determination of Chemical Formula

The elemental makeup of a compound defines its chemical identity, and chemical formulas are the most concise way of representing this elemental makeup. When a compound’s formula is unknown, measuring the mass of its constituent elements is often the first step in determining the formula experimentally.
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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
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Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Overview
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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).

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Updated: Jun 5, 2026

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
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Published on: August 12, 2019

6,6'-oxydichroman.

Meng Wang, Yong-Hao Ye

    Acta Crystallographica. Section E, Structure Reports Online
    |January 5, 2011
    PubMed
    Summary
    This summary is machine-generated.

    A novel organic compound, C(18)H(18)O(3), was synthesized. Its molecular structure features a twofold axis and a specific dihedral angle between benzene rings, with weak intermolecular interactions observed.

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    Area of Science:

    • Organic Chemistry
    • Crystallography

    Background:

    • Synthesis of novel organic compounds is crucial for materials science.
    • Understanding molecular structure informs chemical properties and applications.

    Purpose of the Study:

    • To synthesize and characterize the novel organic compound C(18)H(18)O(3).
    • To elucidate the molecular geometry and intermolecular interactions within the crystal structure.

    Main Methods:

    • Chemical synthesis involving dichroman and concentrated sulfuric acid.
    • X-ray crystallography for structural determination.

    Main Results:

    • Successful synthesis of the title compound C(18)H(18)O(3).
    • The molecule possesses a twofold rotation axis through the central oxygen atom.
    • A dihedral angle of 63.6(3)° was measured between the two benzene rings.
    • Weak C-H⋯π interactions were identified in the crystal lattice.

    Conclusions:

    • The study reports the synthesis and structural characterization of a new organic molecule.
    • The determined molecular geometry and observed intermolecular interactions provide insights into its solid-state behavior.