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Updated: May 31, 2026
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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
Published on: January 19, 2016
4,4'-Methylenebis{N-[(E)-quinolin-2-yl-methylidene]aniline}
Daoud Djamel1, Douadi Tahar, Haffar Djahida
1Laboratoire d'Électrochimie des Matériaux Moléculaires et Complexes, (LEMMC), Département de Génie des Procèdes Faculté de Technologie, Université Ferhat Abbas, Setif 19000, Algeria.
Summary
A novel organic compound, C(33)H(24)N(4), was synthesized using aromatic diamine and quinoline aldehyde. The molecule features two linked aniline moieties with a specific angle between their benzene rings.
Area of Science:
- Organic Chemistry
- Crystallography
- Molecular Structure
Background:
- Schiff base derivatives are important in coordination chemistry and materials science.
- Aromatic diamines and aldehydes are common precursors for synthesizing complex organic molecules.
Purpose of the Study:
- To synthesize and characterize a novel organic compound with potential applications.
- To investigate the molecular structure and conformation of the synthesized Schiff base.
Main Methods:
- The compound was synthesized via the reaction of 4,4'-diamino-diphenyl-methane and quinoline-2-carboxaldhyde.
- Single-crystal X-ray diffraction was used to determine the molecular structure.
Main Results:
- The title compound, C(33)H(24)N(4), was successfully prepared.
- The crystal structure revealed two nearly planar 4-methyl-N-[(E)-quinolin-2-yl-methyl-idene]aniline moieties linked by a methylene group.
- The angle between the mean planes of the two connected benzene rings was determined to be 77.86(11)°.
Conclusions:
- The synthesis yielded the target Schiff base compound.
- The structural analysis provides insights into the conformational preferences of this class of molecules.
- This study contributes to the understanding of structure-property relationships in organic compounds.
Related Concept Videos
01:10Nomenclature of Aryl and Heterocyclic Amines
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.
01:17Nomenclature 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.
01:19Diazonium Group Substitution: –OH and –H
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.
01:11ortho–para-Directing Activators: –CH3, –OH, –NH2, –OCH3
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
01:19Structure of Amines
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.