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1,6-interactions between dimethylamino and aldehyde groups in two biphenyl derivatives
J O'Leary1, J D Wallis, M L Wood
1Department of Chemistry and Physics, The Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, England.
Summary
Two novel biphenyl compounds exhibit similar intramolecular N...C=O interactions. These interactions occur between dimethylamino and aldehyde groups in ortho positions, influencing the molecular structure.
Area of Science:
- Organic Chemistry
- Crystallography
Background:
- Biphenyl compounds are crucial in various chemical applications.
- Understanding intramolecular interactions is key to predicting molecular properties and reactivity.
Purpose of the Study:
- To investigate the structural and electronic properties of novel biphenyl derivatives.
- To analyze the nature and extent of intramolecular interactions in these compounds.
Main Methods:
- Synthesis of 2-(dimethylamino)biphenyl-2'-carboxaldehyde and 2-(dimethylamino)biphenyl-2',6'-dicarboxaldehyde.
- Single-crystal X-ray diffraction analysis to determine molecular structures.
- Analysis of non-covalent interactions, specifically N...C=O distances and angles.
Main Results:
- Both title compounds display significant 1,6-intramolecular interactions between the dimethylamino nitrogen and the aldehyde carbonyl oxygen.
- The N...C=O distances range from 2.929(3) to 3.029(3) Å.
- The dihedral angles between the biphenyl rings are 58.1(1)° and 62.4(1)°, indicating a twisted conformation.
Conclusions:
- The presence of ortho-substituents facilitates strong intramolecular interactions in biphenyl systems.
- These interactions influence the conformational preferences and potentially the reactivity of the molecules.
- The findings contribute to the understanding of structure-property relationships in substituted biphenyls.