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Related Concept Videos

Limitations of Friedel–Crafts Reactions01:26

Limitations of Friedel–Crafts Reactions

Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is stabilized by...
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Electrophilic Aromatic Substitution: Friedel–Crafts Alkylation of Benzene01:17

Electrophilic Aromatic Substitution: Friedel–Crafts Alkylation of Benzene

Friedel–Crafts reactions were developed in 1877 by the French chemist Charles Friedel and the American chemist James Crafts. Friedel–Crafts alkylation refers to the replacement of an aromatic proton with an alkyl group via electrophilic aromatic substitution. A Lewis acid catalyst such as aluminum chloride reacts with an alkyl halide to form a carbocation. The resulting carbocation then reacts with the aromatic ring and undergoes a series of electron rearrangements before giving the final...
Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene01:11

Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene

The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n + 2 rule.
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic factors, steric factors also account...

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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
08:51

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Published on: August 18, 2017

TiGePt--a study of Friedel differences.

Sarah Virginia Ackerbauer1, Horst Borrmann, Hans Beat Bürgi

  • 1Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, D-01187 Dresden, Germany.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|September 24, 2013
PubMed
Summary
This summary is machine-generated.

X-ray diffraction analysis confirmed the non-centrosymmetric crystal structure of TiGePt. Resonant scattering effects, particularly with Mo Kα radiation, were crucial for this determination.

Keywords:
D-PattersonFriedel differencesintermetallic compound

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Area of Science:

  • Crystallography
  • Materials Science
  • Solid State Chemistry

Background:

  • Determining crystal symmetry is fundamental in materials science.
  • Intermetallic compounds like TiGePt exhibit complex structural properties.
  • X-ray diffraction is a primary tool for structural analysis.

Purpose of the Study:

  • To definitively establish the crystal structure of the intermetallic compound TiGePt.
  • To investigate the role of resonant scattering in determining crystal symmetry.
  • To compare the effectiveness of different X-ray radiation sources and temperatures for structural analysis.

Main Methods:

  • X-ray single-crystal diffraction intensity analysis.
  • Analysis of Friedel pair differences (hkl vs. \bar h\bar k\bar l).
  • Statistical estimation of resonant scattering contributions.
  • Antisymmetric D-Patterson function analysis.

Main Results:

  • The crystal structure of TiGePt was confirmed as non-centrosymmetric.
  • Resonant scattering of Platinum (Pt) significantly influences diffraction intensity differences.
  • Mo Kα radiation at 100 K provided more conclusive results than Ag Kα radiation at 295 K.
  • A non-standard atomic model was not required for TiGePt.

Conclusions:

  • The non-centrosymmetric nature of TiGePt is unequivocally determined.
  • Optimized experimental conditions (radiation type and temperature) enhance structural analysis accuracy.
  • Understanding resonant scattering is key for precise crystallographic studies of heavy elements.