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Related Concept Videos

UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

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...
Structure and Nomenclature of Alcohols and Phenols02:23

Structure and Nomenclature of Alcohols and Phenols

Overview
Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
As with other organic compounds, alcohols and phenols...
2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
Nomenclature of Alkynes02:39

Nomenclature of Alkynes

Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
Structure and Nomenclature of Ethers02:28

Structure and Nomenclature of Ethers

Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
Classification of Ethers
Based on their attached substituent groups, ethers can be classified into two...
Structure and Nomenclature of Epoxides02:38

Structure and Nomenclature of Epoxides

Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain is more in the ring having a smaller number of...

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Related Experiment Video

Updated: May 31, 2026

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
12:07

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

2-Meth-oxy-naphthalene-1,4-dione.

Bo Jin, Zhong-Cheng Song, Fu-Sheng Jiang

    Acta Crystallographica. Section E, Structure Reports Online
    |July 15, 2011
    PubMed
    Summary

    A novel compound, C(11)H(8)O(3), was identified from Impatiens balsamina plants. Structural analysis revealed a planar naphthalene-1,4-dione core with a near-planar methoxy substituent.

    Area of Science:

    • Natural Product Chemistry
    • Organic Chemistry
    • Plant Sciences

    Background:

    • Impatiens balsamina (balsam) is a plant species known for its medicinal properties.
    • Isolation and characterization of novel compounds from natural sources are crucial for drug discovery.
    • Previous research has explored various phytochemicals from Impatiens species.

    Purpose of the Study:

    • To isolate and characterize a novel chemical compound from Impatiens balsamina.
    • To determine the precise three-dimensional structure of the isolated compound.
    • To investigate the structural features of the naphthalene-1,4-dione core and its substituents.

    Main Methods:

    • Extraction and isolation of the title compound from Impatiens balsamina plant material.
    • Single-crystal X-ray diffraction analysis to elucidate the molecular structure.

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    Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
    12:07

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    Published on: April 1, 2013

    Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
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    Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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    Published on: July 17, 2020

  • Crystallographic data collection and refinement to determine atomic coordinates and bond lengths.

    • Main Results:

    • The title compound, with the molecular formula C(11)H(8)O(3), was successfully isolated.
    • X-ray crystallographic analysis confirmed a planar naphthalene-1,4-dione structure.
    • The methoxy substituent was found to be nearly coplanar with the naphthalene rings, with minimal deviations.

    Conclusions:

    • The study reports the isolation and full structural characterization of a new compound from Impatiens balsamina.
    • The determined structure provides insights into the stereochemistry of naphthalene-1,4-dione derivatives.
    • This finding contributes to the phytochemical knowledge of Impatiens species and may guide future research in medicinal chemistry.