2839. DCPA

Nomenclature

CAS number: 1861-32-1
2,3,5,6-Tetrachloro-1,4-benzenedicarboxylic acid dimethyl ester; 2,3,5,6-tetrachloroterephthalic acid dimethyl ester; dimethyl 2,3,5,6-tetrachloroterephthalate; chlorthal-methyl; Dacthal; Rid.
C10H6Cl4O4; mol wt 331.96.
C 36.18%, H 1.82%, Cl 42.72%, O 19.28%.

Description and references

Prepn: Lindemann, US 2923634 (1960 to Diamond Alkali). Toxicity data: G. W. Bailey, J. L. White, Residue Rev. 10, 97 (1965).

Chemical structure

Properties

Crystals from methanol, mp 155-156°. Solubility: <5% in water; >5% in acetone, cyclohexanone, xylene. LD50 orally in rats: >3000 mg/kg (Bailey, White).

Use

Pre-emergent herbicide.