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Updated: Jun 1, 2026

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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
Published on: January 19, 2016
(E)-4-Bromo-N-(2,4-dimethoxy-benzyl-idene)aniline
Summary
This study details the crystal structure of a Schiff base compound, C(15)H(14)BrNO(2). The molecule exhibits specific E configuration and intermolecular interactions, forming rows in its crystal lattice.
Area of Science:
- Crystallography
- Organic Chemistry
- Materials Science
Background:
- Schiff base compounds are versatile organic molecules with diverse applications.
- Understanding the solid-state structure of Schiff bases is crucial for predicting their properties and designing new materials.
Purpose of the Study:
- To elucidate the detailed crystal structure of the Schiff base compound C(15)H(14)BrNO(2).
- To analyze the molecular geometry, including bond configurations and substituent orientations.
- To investigate intermolecular interactions and their role in crystal packing.
Main Methods:
- Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
- Analysis of bond lengths, bond angles, dihedral angles, and deviations from planarity.
- Identification and characterization of intermolecular interactions, such as hydrogen bonds and van der Waals forces.
Main Results:
- The compound C(15)H(14)BrNO(2) was confirmed to possess an E configuration around the C=N bond.
- Methoxy substituents showed minimal deviation from the dimethoxy-phenyl ring plane.
- The crystal structure revealed the formation of inversion-related dimers linked by weak C-H⋯N and C-H⋯O interactions, forming rows parallel to the b axis.
Conclusions:
- The study provides a comprehensive structural characterization of the Schiff base compound.
- The identified crystal packing and intermolecular interactions offer insights into the solid-state behavior of this class of compounds.
- This structural data can serve as a foundation for further research into the functional properties and potential applications of related Schiff bases.
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The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.
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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
Nomenclature of Primary Amines
Primary, secondary, and tertiary amines are compounds consisting of one, two, and three alkyl groups connected to the amino group (–NH2), respectively. As depicted in Figure 1, the common name of the primary amines is obtained by adding the suffix -amine to the alkyl substituent attached to the amino group as the corresponding alkylamine.
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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.

