2-[(4-Ethyl-phen-yl)imino-meth-yl]-3,5-dimethoxy-phenol

Area of Science:

• Organic Chemistry
• Crystallography
• Molecular Structure Determination

Background:

• Understanding tautomerism is crucial in organic chemistry.
• Intramolecular hydrogen bonds significantly influence molecular conformation.
• Phenol-imine systems are important in various chemical applications.

Purpose of the Study:

• To elucidate the tautomeric form and hydrogen bonding of a specific C(17)H(19)NO(3) compound.
• To determine the crystal structure and precise molecular geometry.
• To analyze the conformational preferences influenced by substituents.

Main Methods:

• Single-crystal X-ray diffraction was employed for structural analysis.
• Analysis of bond lengths, bond angles, and dihedral angles.
• Investigation of tautomeric equilibrium and hydrogen bonding interactions.

Main Results:

• The compound exists in the phenol-imine tautomeric form.
• A resonance-assisted intramolecular hydrogen bond (O⋯N = 2.551 Å) was identified.
• The dihedral angle between the benzene rings is 45.42°, and methoxy groups exhibit coplanarity.

Conclusions:

• The crystal structure confirms the phenol-imine tautomer stabilized by a strong intramolecular hydrogen bond.
• The observed conformation is influenced by steric and electronic factors, including methoxy group orientation.
• This detailed structural information provides a basis for understanding the compound's chemical properties and reactivity.