Racemic 2'-hydroxy-4',4'-dimethylpyran-1,5-dihydroxyxanthone monohydrate

Area of Science:

• Crystallography
• Organic Chemistry
• Structural Chemistry

Background:

• Xanthones are a class of organic compounds with diverse biological activities.
• Understanding the crystal structure of natural products like Pruniflorone N is crucial for structure-activity relationship studies.

Purpose of the Study:

• To determine the crystal structure of Pruniflorone N monohydrate.
• To analyze the molecular conformation and intermolecular interactions in the crystal.

Main Methods:

• Single-crystal X-ray diffraction was used to elucidate the crystal structure.
• Analysis of bond lengths, bond angles, and intermolecular forces was performed.

Main Results:

• Pruniflorone N crystallized as a monohydrate (C18H16O6·H2O).
• The xanthone skeleton is nearly planar, with hydroxyl substituents showing minor deviations.
• The pyran ring exhibits disorder over two positions.
• Intramolecular hydrogen bonding and a 3D network of intermolecular O-H⋯O and C-H⋯O interactions were observed.
• Significant pi-pi interactions were identified between xanthone molecules.

Conclusions:

• The crystal structure of Pruniflorone N monohydrate provides detailed insights into its solid-state arrangement.
• The observed hydrogen bonding and pi-pi stacking interactions likely influence the compound's physical properties and potential biological interactions.