3- Chlorophthalic acid

Lowering the reaction temperature or adding urea or basic solvents decreases the extent of chlorination. Solvents such as nitrobenzene, trichlorobenzene, alcohols, glycols, pyridine, and aliphatic hydrocarbons are employed. By using substituted phthalic acids such as 4-chlorophthalic acid anhydride, 4-sulfophthalic acid anhydride, or 4-nitrophthalimide, phthalocyanines with inner substitution can be produced. The products can often be purified by sublimation in vacuo at 300-400 °C. Soluble Pc s can be purified by recrystallization. 

Another process reported is based on dechloro coupling of 4-chlorophthalic acid salt in the presence of a palladium catalyst and sodium formate [25]. 

Erythro- -hydroxy-DL-Nle tetra-chlorophthalic acid salt... 

The protected amino acid tetrachlorophthalimidoacetic acid synthesised from tetra-chlorophthalic anhydride and glycine using DMF as the solvent was conducted on a molar scale to yield 300 g of the product after 8 min (Scheme 9.8)113. 

Benzenedicarboxylic acid, 4-chloro-, monosodium salt. See Sodium-4-chlorophthalate... 

Sodium, (chloro (phenylsulfonyl) amino)-. See Chloramine-B Sodium-4-chlorophthalate CAS 56047-23-5 EINECS/ELINCS 259-963-2 Synonyms 1,2-Benzenedicarboxylic acid, 4 chloro-, monosodium salt Monosodium-4-chlorophthalate Empirical C8H4CINa04 Formula CIC6H3(COOH)COONa Properties Wh. to It. gray powd. 

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