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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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.

ortho–para-Directing Deactivators: Halogens

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Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...

Halogens

Halogens

Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.

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Fully and partially fluorinated flavone derivatives.

Akiko Hori¹, Kohei Naganuma

¹School of Science, Kitasato University, Kitasato 1-15-1, Sagamihara, Kanagawa 228-8555, Japan. hori@kitasato-u.ac.jp

Acta Crystallographica. Section C, Crystal Structure Communications

|May 6, 2010

Summary

Crystal structures reveal how fluorine substituents influence flavone derivative geometry. Repulsion causes twisting in one, while coplanar structures show arene-perfluoroarene interactions in another.

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Area of Science:

Organic Chemistry
Crystallography
Supramolecular Chemistry

Background:

Flavonoids are a diverse class of natural products with significant biological activities.
Fluorinated organic compounds often exhibit unique chemical and physical properties.
Understanding the solid-state behavior of fluorinated flavones is crucial for designing new materials and pharmaceuticals.

Purpose of the Study:

To elucidate the crystal structures of two fluorinated flavone derivatives.
To investigate the impact of fluorine substitution on molecular conformation and intermolecular interactions.
To explore the role of arene-perfluoroarene interactions in crystal packing.

Main Methods:

Single-crystal X-ray diffraction analysis was performed on both compounds.
Structural parameters, including bond lengths, angles, and torsion angles, were analyzed.
Intermolecular interactions, such as hydrogen bonding and pi-pi stacking, were identified and characterized.

Main Results:

Compound (I), 5,6,7,8-tetrafluoro-2-(2,3,4,5,6-pentafluorophenyl)-4H-1-benzopyran-4-one, exhibits a twisted conformation between the pentafluorophenyl group and the pyranone moiety due to steric repulsion of fluorine atoms.
A significant CO(delta(-))...pi(delta(+)) intermolecular interaction was observed in (I) between the carbonyl oxygen and the pentafluorophenyl ring.
Compound (II), 5,6,7,8-tetrafluoro-2-phenyl-4H-1-benzopyran-4-one, displays a nearly coplanar arrangement of the phenyl and pyranone groups.
Head-to-tail columnar stacking driven by arene-perfluoroarene interactions was identified in (II) between the phenyl and tetrafluorophenylene moieties.

Conclusions:

Fluorine substitution significantly influences the molecular conformation and crystal packing of flavone derivatives.
Steric repulsion from fluorine atoms can lead to significant twisting in the molecular structure.
Arene-perfluoroarene interactions play a key role in directing the supramolecular assembly in fluorinated aromatic systems.