2,2''-Bis(trifluoromethyl)-[1,1':4',1''-terphenyl]-4,4''-diamine
[CAS# 1815602-33-5]

Identification

• Classification: Organic raw materials >> Organic fluorine compound >> Fluoroaniline series
• Name: 2,2''-Bis(trifluoromethyl)-[1,1':4',1''-terphenyl]-4,4''-diamine
• Molecular Formula: C₂₀H₁₄F₆N₂
• Molecular Weight: 396.33
• CAS Registry Number: 1815602-33-5
• SMILES: NC1=CC=C(C2=CC=C(C3=CC=C(N)C=C3C(F)(F)F)C=C2)C(C(F)(F)F)=C1

Discovery and Applications

2,2''-Bis(trifluoromethyl)-[1,1':4',1''-terphenyl]-4,4''-diamine is a highly substituted aromatic diamine based on a terphenyl framework, in which three benzene rings are linearly connected and functionalized with amino groups at the 4 and 4'' positions and trifluoromethyl substituents at the 2 and 2'' positions. Aromatic diamines of this type are important intermediates in polymer chemistry, materials science, and advanced organic synthesis due to their rigid structure, electron-withdrawing substituents, and ability to form strong intermolecular interactions through hydrogen bonding.

The molecular structure consists of a 1,1':4',1''-terphenyl backbone, which provides an extended, planar aromatic system. The amino groups located at the terminal para positions serve as nucleophilic sites capable of reacting with electrophiles such as acid chlorides, anhydrides, or isocyanates to form polyamides, polyimides, or polyureas. The trifluoromethyl groups at the ortho positions introduce strong electron-withdrawing effects and significant steric hindrance, which influence both the electronic distribution and the conformational behavior of the molecule. These substituents also enhance thermal and oxidative stability, which is important for high-performance material applications.

The synthesis of 2,2''-bis(trifluoromethyl)-[1,1':4',1''-terphenyl]-4,4''-diamine typically involves multi-step aromatic coupling and functional group transformations. Palladium-catalyzed cross-coupling reactions such as Suzuki or Ullmann-type couplings are commonly used to construct the terphenyl backbone from appropriately substituted aryl halides and boronic acids. Subsequent nitration and reduction steps introduce the amino groups at the desired positions. Careful control of reaction conditions is required to achieve regioselectivity and to preserve the trifluoromethyl substituents during synthesis.

In polymer chemistry, aromatic diamines with bulky and electron-withdrawing substituents are widely used as monomers for the preparation of high-performance polymers. The presence of trifluoromethyl groups can reduce intermolecular packing, increase free volume, and improve solubility of the resulting polymers, while maintaining high thermal stability. When reacted with dianhydrides, this compound can form polyimides with excellent mechanical strength, chemical resistance, and dielectric properties. Such materials are used in electronics, aerospace components, and advanced coatings.

In addition to polymer applications, this compound can serve as a building block for functional materials and organic electronic components. The extended conjugated system of the terphenyl core allows for efficient charge transport and optical properties, while the amino groups enable further derivatization into dyes, ligands, or supramolecular assemblies. The trifluoromethyl substituents can also influence photophysical behavior by modifying electron distribution and intermolecular interactions.

Beyond materials science, the compound is useful in organic synthesis as a rigid, multifunctional intermediate. The amino groups can undergo acylation, alkylation, or condensation reactions, allowing the preparation of a wide range of derivatives. The steric and electronic effects imparted by the trifluoromethyl groups make it valuable for designing molecules with controlled reactivity and stability.

Overall, 2,2''-bis(trifluoromethyl)-[1,1':4',1''-terphenyl]-4,4''-diamine is a structurally complex aromatic diamine combining a rigid terphenyl backbone with electron-withdrawing trifluoromethyl substituents and reactive amino groups. Its unique combination of stability, reactivity, and structural features makes it an important intermediate in polymer chemistry, materials science, and advanced organic synthesis.

References

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