3-Bromo-chroman-4-one.

Area of Science:

• Organic Chemistry
• Crystallography
• Supramolecular Chemistry

Background:

• 4-Chromanone is a key heterocyclic scaffold in medicinal chemistry.
• Understanding the conformational and supramolecular properties of its derivatives is crucial for drug design.
• Bromination is a common synthetic route to introduce functional groups and modify molecular properties.

Purpose of the Study:

• To synthesize and characterize a novel brominated 4-chromanone derivative.
• To elucidate the conformational preferences of the heterocyclic ring.
• To investigate the intermolecular interactions governing the crystal packing.

Main Methods:

• Synthesis of the title compound (C9H7BrO2) via bromination of 4-chromanone using copper bromide.
• Single-crystal X-ray diffraction analysis to determine the molecular and crystal structure.
• Analysis of non-covalent interactions, including hydrogen bonding and π-π stacking.

Main Results:

• The title compound was successfully synthesized and its structure elucidated.
• The heterocyclic ring adopts a half-chair conformation.
• The supramolecular assembly is characterized by a weak C-H⋯O hydrogen bond.
• Significant π-π stacking interactions were observed between adjacent benzene rings with specific geometric parameters (centroid-centroid distance, perpendicular distance, and offset).

Conclusions:

• The study provides insights into the conformational flexibility of brominated chromanone derivatives.
• The identified supramolecular interactions highlight the importance of non-covalent forces in crystal engineering.
• The findings contribute to the understanding of structure-property relationships in heterocyclic compounds.