(4aR,8aR)-2,3-Diphenyl-4a,5,6,7,8,8a-hexa-hydro-quinoxaline

Area of Science:

• Organic Chemistry
• Crystallography
• Molecular Structure

Background:

• Chiral molecules are fundamental in chemistry and biology.
• Understanding molecular geometry is crucial for predicting chemical properties.
• Intermolecular forces significantly impact crystal packing and conformation.

Purpose of the Study:

• To determine the absolute configuration and detailed three-dimensional structure of the chiral molecule C(20)H(20)N(2).
• To investigate the types and significance of non-covalent interactions present in the molecule.
• To analyze the conformational preferences of the heterocyclic and carbocyclic rings.

Main Methods:

• Chiral synthesis utilizing known chiral reagents.
• X-ray crystallography for determining molecular structure and absolute configuration.
• Analysis of intermolecular interactions, including van der Waals forces and C-H⋯π interactions.

Main Results:

• The molecule C(20)H(20)N(2) was confirmed as chiral, with its absolute configuration derived from the starting materials.
• The crystal structure revealed specific conformational states: a twist-boat for the quinoxaline ring and a chair for the cyclohexane ring.
• The angle between the phenyl ring planes was measured at 65.6(1)°.
• C-H⋯π ring interactions were identified as significant non-covalent forces contributing to the molecular assembly.

Conclusions:

• The study successfully elucidated the complex three-dimensional structure and chirality of C(20)H(20)N(2).
• The identified conformational preferences and intermolecular interactions provide insights into the molecule's stability and potential reactivity.
• This detailed structural analysis contributes to the broader understanding of chiral molecular architectures and their interactions.