135trichlorobenzene

1,3,5-Trichlorobenzene, also known as 135-trichlorobenzene, is an organochlorine aromatic hydrocarbon in which three chlorine atoms substitute the benzene ring at the 1, 3, and 5 positions. Its chemical formula is C6H3Cl3 and the approximate molecular weight is 181.44 g/mol. It is typically encountered as a colorless to pale yellow liquid at room temperature, with a relatively high boiling point and low vapor pressure. It is sparingly soluble in water and dissolves in many organic solvents such as acetone, ether, and chlorinated hydrocarbons.

Production and purification generally involve the chlorination of benzene or of chlorobenzene derivatives, followed by distillation to separate the 1,3,5-trichlorobenzene isomer from other chlorinated benzenes. The process aims to maximize selectivity for the symmetrical 1,3,5-substitution pattern, which can complicate separation due to close-boiling isomers.

Applications for 1,3,5-trichlorobenzene include use as a solvent in chemical manufacturing, particularly for high-temperature processes, and as an intermediate in the production of other chlorinated aromatics, dyes, and polymers. It also serves as a heat-transfer fluid in some industrial settings because of its stability at elevated temperatures.

Safety and environmental considerations are important. The compound is hazardous if inhaled, swallowed, or absorbed through the skin and can irritate the eyes, skin, and respiratory tract. It is persistent in the environment and may be toxic to aquatic life. Proper handling includes protective equipment, adequate ventilation, and storage away from heat and oxidizers, with attention to spill response and waste disposal according to relevant regulations.