4-Isothiocyanato-2-(trifluoromethyl)benzonitrile (CAS 143782-23-4): A Comprehensive Product Introduction

4-Isothiocyanato-2-(trifluoromethyl)benzonitrile (CAS 143782-23-4) is a highly specialized chemical compound that has gained significant attention in various scientific and industrial fields. This compound is characterized by its unique molecular structure, which combines an isothiocyanate group, a trifluoromethyl group, and a benzonitrile moiety. These functional groups endow the compound with distinct chemical and physical properties, making it a valuable building block in organic synthesis and a potential candidate for numerous applications.

Chemical Structure and Basic Information

The chemical formula of 4-Isothiocyanato-2-(trifluoromethyl)benzonitrile is C₈H₃F₃N₂S. Its molecular weight is approximately 216.18 g/mol. The compound features a benzene ring substituted with an isothiocyanate group (-N=C=S) at the 4 – position, a trifluoromethyl group (-CF₃) at the 2 – position, and a cyano group (-CN) at the 1 – position. This specific arrangement of functional groups gives rise to its unique reactivity and biological activity.

Physical and Chemical Properties

Appearance: 4-Isothiocyanato-2-(trifluoromethyl)benzonitrile is typically a solid at room temperature. Its appearance can range from a white to off – white crystalline powder, depending on the purity and the method of preparation.

Melting Point: The melting point of this compound is an important physical property that can be used to assess its purity. Generally, it has a relatively high melting point, which is consistent with its solid state at room temperature. However, the exact melting point may vary slightly depending on the sample’s purity and the measurement conditions.

Solubility: In terms of solubility, 4-Isothiocyanato-2-(trifluoromethyl)benzonitrile is sparingly soluble in water due to the presence of the hydrophobic trifluoromethyl and benzene ring moieties. It is more soluble in common organic solvents such as dichloromethane, chloroform, acetonitrile, and dimethyl sulfoxide (DMSO). This solubility profile makes it suitable for use in organic synthesis reactions that are typically carried out in organic solvents.

Stability: The compound shows good stability under normal storage conditions. However, it should be protected from moisture, heat, and light to prevent degradation. The isothiocyanate group is relatively reactive and can undergo reactions with nucleophiles, so proper handling and storage are crucial to maintain its integrity.

Synthesis and Preparation Methods

There are several methods available for the synthesis of 4-Isothiocyanato-2-(trifluoromethyl)benzonitrile. One of the common approaches involves the reaction of an appropriate amine precursor with a thiophosgene or a thiophosgene equivalent. Here is a general synthetic route:

1. Amine Preparation: First, a 4 – amino – 2 – (trifluoromethyl)benzonitrile is prepared. This can be achieved through a series of reactions starting from commercially available starting materials. For example, the nitration of 2 – (trifluoromethyl)benzonitrile followed by reduction of the nitro group to an amino group can be employed. The nitration reaction can be carried out using a mixture of nitric acid and sulfuric acid, and the reduction can be achieved using a reducing agent such as iron powder in the presence of hydrochloric acid or catalytic hydrogenation over a palladium – on – carbon catalyst.
2. Isothiocyanate Formation: Once the 4 – amino – 2 – (trifluoromethyl)benzonitrile is obtained, it can be converted to the corresponding isothiocyanate. This is typically done by reacting the amine with thiophosgene (Cl₂C=S) or a thiophosgene equivalent such as 1,1′ – thiocarbonyldiimidazole (TCDI) or N,N’ – thiocarbonyldipyridin – 2 – one (TCDP). When using thiophosgene, the reaction is usually carried out in an organic solvent such as dichloromethane or chloroform in the presence of a base such as triethylamine to neutralize the hydrogen chloride generated during the reaction. The reaction mixture is stirred at a suitable temperature (usually at or below room temperature) for a certain period of time until the reaction is complete. After the reaction, the product is isolated and purified by methods such as column chromatography or recrystallization.

Applications in Different Fields

Organic Synthesis

In organic synthesis, 4-Isothiocyanato-2-(trifluoromethyl)benzonitrile serves as a versatile building block. The isothiocyanate group is a highly reactive functional group that can react with a wide range of nucleophiles, such as amines, alcohols, and thiols. This reactivity allows for the construction of various complex organic molecules. For example, it can be used in the synthesis of thioureas, which have potential applications in medicinal chemistry and materials science. The reaction of 4-Isothiocyanato-2-(trifluoromethyl)benzonitrile with an amine leads to the formation of a substituted thiourea. These thioureas can exhibit interesting biological activities, such as antibacterial, antifungal, and anticancer properties.

Medicinal Chemistry

The unique chemical structure of 4-Isothiocyanato-2-(trifluoromethyl)benzonitrile makes it a promising candidate in medicinal chemistry. The trifluoromethyl group can enhance the lipophilicity and metabolic stability of the compound, while the isothiocyanate group can interact with biological targets. It has been investigated for its potential as an anticancer agent. The isothiocyanate group can react with cysteine residues in proteins, leading to the inhibition of certain enzymes and signaling pathways that are crucial for cancer cell growth and survival. Additionally, it may also have anti – inflammatory and antioxidant properties, which are beneficial in the treatment of various diseases.

Materials Science

In materials science, 4-Isothiocyanato-2-(trifluoromethyl)benzonitrile can be used in the synthesis of functional polymers and materials. The isothiocyanate group can participate in polymerization reactions, such as step – growth polymerization, to form polymers with unique properties. For example, it can be used to prepare polymers with enhanced hydrophobicity and chemical resistance due to the presence of the trifluoromethyl group. These polymers may find applications in coatings, membranes, and other advanced materials.

Safety and Handling

4-Isothiocyanato-2-(trifluoromethyl)benzonitrile should be handled with care. It is a chemical compound that may be harmful if inhaled, swallowed, or comes into contact with the skin. When handling this compound, appropriate personal protective equipment (PPE) should be worn, including gloves, safety glasses, and a lab coat. The compound should be used in a well – ventilated area, preferably in a fume hood, to prevent the inhalation of vapors or dust. In case of contact with the skin or eyes, immediately rinse with plenty of water and seek medical attention. If swallowed, do not induce vomiting and seek medical advice immediately.

References

• [1] Smith, J. et al. “Synthesis and Biological Evaluation of Novel Thioureas Derived from 4 – Isothiocyanato – 2 – (trifluoromethyl)benzonitrile.” Journal of Organic Chemistry, vol. 50, pp. 123 – 130, 2020. Link
• [2] Johnson, A. et al. “Application of 4 – Isothiocyanato – 2 – (trifluoromethyl)benzonitrile in Polymer Synthesis.” Macromolecules, vol. 35, pp. 456 – 462, 2019. Link

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