12-Ethyl-6a,10a-di-hydro-5H-6-oxachrysene

Area of Science:

• Crystallography
• Organic Chemistry
• Molecular Structure Analysis

Background:

• Understanding the three-dimensional arrangement of atoms in organic molecules is crucial for predicting their properties and reactivity.
• The study of fused ring systems, like naphthalene and benzene, provides insights into electronic and steric effects within molecules.

Purpose of the Study:

• To elucidate the precise molecular geometry and crystal packing of the title compound, C19H16O.
• To analyze the conformation of the pyran ring and the spatial relationship between the naphthalene and fused benzene rings.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
• Analysis of bond lengths, bond angles, and dihedral angles provided detailed structural information.
• Identification of intermolecular interactions, such as hydrogen bonds, was performed.

Main Results:

• The pyran ring adopts a half-chair conformation.
• The naphthalene ring system is essentially planar, with a dihedral angle of 14.37(5)° relative to the fused benzene ring.
• Molecules form inversion dimers through weak C-H⋯O hydrogen bonds, creating R2²(6) loops.

Conclusions:

• The crystal structure of C19H16O reveals specific conformational preferences and intermolecular interactions.
• The observed hydrogen bonding network influences the overall crystal packing and molecular assembly.