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Related Concept Videos

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:
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...
Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
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Nomenclature of Aromatic Compounds with Multiple Substituents01:11

Nomenclature of Aromatic Compounds with Multiple Substituents

When more than one substituent is present on the benzene ring, the IUPAC nomenclature depends on the number of substituents present.
For disubstituted benzene derivatives, with two groups attached to the benzene ring, three constitutional isomers are possible. For example, consider dimethyl benzene, often called xylene, where the second methyl group can be substituted at the second, third, or fourth carbon. The relative position of the substituents is represented by prefixes ortho, meta, or...
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...
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.

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Related Experiment Video

Updated: Jun 5, 2026

A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species
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Published on: August 16, 2018

2,2'-Bis(prop-2-yn-yloxy)-1,1'-binaphth-yl.

Wu Zhang1, Qingxia Cui, Zhaowen Yu

  • 1Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, Henan, People's Republic of China.

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

The crystal structure of a C(26)H(18)O(2) compound reveals a molecule positioned on a twofold rotation axis. Its naphthyl rings are nearly perpendicular, with no observed hydrogen bonds or pi-pi stacking interactions.

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Molecular Structure

Background:

  • Understanding molecular arrangements is crucial in materials science and drug design.
  • The study of polycyclic aromatic hydrocarbons provides insights into electronic and structural properties.

Purpose of the Study:

  • To determine the precise three-dimensional structure of the title compound, C(26)H(18)O(2).
  • To investigate intermolecular interactions and packing in the crystalline state.

Main Methods:

  • Single-crystal X-ray diffraction was employed to analyze the molecular and crystal structure.
  • The molecular geometry, including dihedral angles, was precisely determined.

Main Results:

  • The molecule of C(26)H(18)O(2) crystallizes with the molecule situated on a twofold rotation axis.
  • The two naphthyl ring planes exhibit a dihedral angle of 82.42(1)°, indicating near-perpendicular orientation.
  • No classical hydrogen bonds or aromatic π-π stacking interactions were identified in the crystal structure.

Conclusions:

  • The crystal packing is dominated by non-classical interactions, influenced by the near-perpendicular orientation of the naphthyl rings.
  • The structural data provides a foundation for understanding the physical and chemical properties of this compound.