70172-92-8

Upstream product

• 51238-67-6 1,3-dichloro-5,5-dimethyl-cyclohexa-1,3-diene 
• 95-47-6 o-xylene 
• 67-66-3 chloroform 
• 10026-13-8 phosphorus pentachloride 
• 126-81-8 dimedone 

Downstream Products

• 51971-64-3 4,6-dichloroisobenzofuran-1,3-diketone 
• 679428-40-1 1,3-dibromo-2,4-dichloro-5,6-dimethyl-benzene 

Relevant academic research and scientific papers

Remarkably Selective Chlorination of Phthalic Anhydride and Its Monochlorinated Derivatives

The vapor-phase chlorination of phthalic anhydride 1 and its monochlorinated derivatives 2 and 3 in the temperature range from 390 to 600 deg C with elemental chlorine has been investigated and found to be highly selective.Thus, chlorination of 1 in the temperature range from 390 to 450 deg C was found to give high yields of monochlorinated products accompanied by only small amounts of dichlorination with a high degree of regioselectivity favoring the formation of 4-chlorophthalic anhydride.Chlorination of a 3-chlorophthalic anhydride 3 by this method has provided thefirst direct synthesis of 3,5-dichlorophthalic anhydride 7 from phthalic anhydride via chlorination.

PROCESS FOR HALOGENATION OF BENZENE AND BENZENE DERIVATIVES

In a process of halogenation of benzene or benzene derivatives, di-substituted halobenzene derivatives having para-aromatic compounds or tri-substituted halobenzene derivatives having 1,2,4-substituted aromatic compounds are selectively produced. In halogenation of benzene or benzene derivatives, a fluorine-containing zeolite catalyst such as L-type zeolite, or a zeolite catalyst having the crystal size of at most 100 nm is used. The reaction is preferably effected in the presence of a solvent, and the solvent is preferably a halogenated compound.