(E)-3-(1-Naphthyl-amino)-methyl-ene-(+)-camphor

Area of Science:

• Crystallography
• Organic Chemistry
• Supramolecular Chemistry

Background:

• Ketoamines are versatile organic compounds with applications in synthesis and materials science.
• Understanding the solid-state structure of ketoamines is crucial for predicting their physical and chemical properties.
• The title compound, (E)-1,7,7-trimethyl-3-[(1-naphthyl-amino)-methyl-idene]bicyclo-[2.2.1]heptan-2-one, is a derivative of camphor.

Purpose of the Study:

• To elucidate the detailed crystal structure of the title ketoamine.
• To analyze the conformational differences between independent molecules in the asymmetric unit.
• To investigate the intermolecular interactions stabilizing the crystal lattice.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
• The crystal structure was solved and refined to atomic resolution.
• Conformational analysis and hydrogen bonding interactions were examined.

Main Results:

• The asymmetric unit contains two independent ketoamine molecules (A and B) with an E configuration about the alkene.
• Significant conformational differences were observed in the orientation of the naphthyl rings relative to the camphor core.
• The torsion angles about the enamine C-N bond are 21.3(7)° for molecule A and -24.4(8)° for molecule B.
• Intermolecular N-H⋯O hydrogen bonds link adjacent molecules, forming extended chains parallel to the [001] direction (C(2)(12) graph set).

Conclusions:

• The crystal structure of the title ketoamine has been successfully determined.
• The study highlights conformational flexibility within the ketoamine structure and the role of intermolecular hydrogen bonding in crystal packing.
• The observed crystal packing, stabilized by hydrogen bonds, provides insights into the supramolecular assembly of ketoamine derivatives.