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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.
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.

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N-Ferrocenymethyl-N-phenyl-propionamide.

Abdelhamid Khelef, Belgacem Terki, Mohammed Sadok Mahboub

    Acta Crystallographica. Section E, Structure Reports Online
    |May 17, 2012
    PubMed
    Summary

    This study details the crystal structure of a novel iron compound, [Fe(C(5)H(5))(C(15)H(16)NO)], revealing specific molecular conformations and intermolecular interactions. The findings provide insights into organometallic compound structural chemistry.

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    Area of Science:

    • Organometallic Chemistry
    • Crystallography
    • Coordination Chemistry

    Background:

    • Organometallic compounds featuring cyclopentadienyl (Cp) ligands are crucial in catalysis and materials science.
    • Understanding the precise three-dimensional structure of these compounds is essential for predicting their reactivity and properties.

    Purpose of the Study:

    • To elucidate the detailed molecular structure and crystal packing of the novel iron compound [Fe(C(5)H(5))(C(15)H(16)NO)].
    • To analyze the conformation of the cyclopentadienyl rings and the orientation of the amide substituent.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
    • Analysis of bond lengths, bond angles, and torsion angles provided detailed structural information.

    Main Results:

    • The two cyclopentadienyl (Cp) rings exhibit a staggered conformation with a small dihedral angle of 3.7°.
    • The amide group is oriented nearly perpendicular to the substituted Cp ring (torsion angle 101.3°).
    • Weak C-H⋯O hydrogen bonds were identified, linking adjacent molecules in the crystal lattice.

    Conclusions:

    • The study provides a precise structural characterization of the title iron complex.
    • The observed conformation and intermolecular interactions offer insights into the solid-state behavior of this organometallic compound.