4 - Bromophenyl Isocyanate (CAS 2493 - 02 - 9) is a high - quality chemical compound offered by our factory with the best price. The molecular formula of 4 - Bromophenyl Isocyanate is C₇H₄BrNO, and its molecular weight is approximately 214.02 g/mol. This product usually appears as a colorless to light yellow liquid or crystalline solid, depending on the purity and environmental conditions. It has a characteristic pungent odor. The boiling point of 4 - Bromophenyl Isocyanate is around 237 - 239°C, and the melting point is about 19 - 21°C. It is soluble in common organic solvents such as toluene, dichloromethane, and ethyl acetate, but insoluble in water.
4 - Bromophenyl Isocyanate has a wide range of applications in the chemical industry. In organic synthesis, it serves as a crucial building block for the preparation of various functionalized compounds. For example, it can react with amines to form ureas, which are important intermediates in the synthesis of pesticides, pharmaceuticals, and dyes. In the field of polymer chemistry, it can be used as a monomer or cross - linking agent to modify polymer properties, such as improving the heat resistance and mechanical strength of polymers. Additionally, it has applications in the production of specialty coatings, adhesives, and elastomers due to its ability to form strong covalent bonds with other functional groups.
When using 4 - Bromophenyl Isocyanate, strict safety precautions must be taken. First of all, it should be used in a well - ventilated area or under a fume hood to prevent inhalation of its vapors. Personal protective equipment, including safety goggles, gloves, and a lab coat, should be worn. During the handling process, avoid contact with skin and eyes. In case of contact, immediately rinse with plenty of water and seek medical attention. When using it in a reaction, appropriate reaction conditions should be selected according to the reaction type and purpose. Generally, reactions involving 4 - Bromophenyl Isocyanate are carried out in anhydrous conditions to avoid side reactions with water. The reaction temperature, reaction time, and the molar ratio of reactants should be carefully controlled to ensure the efficiency and selectivity of the reaction.
Caso 1: Síntesis farmacéutica
A pharmaceutical company was synthesizing a new anti - inflammatory drug. 4 - Bromophenyl Isocyanate was used as a key intermediate. The reaction involved reacting 4 - Bromophenyl Isocyanate with a specific amine under mild reaction conditions (room temperature and in an inert atmosphere). By carefully controlling the reaction time and molar ratio, the yield of the intermediate reached over 80%. After subsequent purification and further reactions, the final anti - inflammatory drug was successfully synthesized, which showed excellent anti - inflammatory effects in pre - clinical trials.
Caso 2: Modificación de polímeros
A polymer research team was trying to improve the heat resistance of a certain type of polyurethane. They added 4 - Bromophenyl Isocyanate as a cross - linking agent during the polymerization process. By adjusting the amount of 4 - Bromophenyl Isocyanate, the cross - linking density of the polyurethane was optimized. The modified polyurethane showed a significant increase in heat distortion temperature, from 80°C to 120°C, making it more suitable for high - temperature applications such as automotive engine components.
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