Common name

Chlorthal-dimethyl

Chemical name

Dimethyl tetrachloroterephthalate

CAS No

1861-32-1

EINECS No.

217-464-7

Molecular formula

C10H6Cl4O4

Description

1.Melting Point:155-156C

2.Vapour Pressure: 2.5E-07mmHg at 25C

3.Molecular weight:331.9642

4.Boiling point:422C at 760 mmHg

5.Flash pioint:174.7C

6.Density:1.558g/cm3

Function

Chlorthal is the common name given to this arylaliphatic acid by the

International Standards Organization, but the herbicide was renamed

DCPA by the Weed Society of America. The mechanism of action of

arylaliphatic acid pesticides is antagonism of auxin growth hormones.

They induce cell elongation and tissue proliferation, produce adventitious

roots, modify the arrangement of leaves and other organs and in some

instances cause fruit to develop in the absence of fertilization.

DCPA is used as a pre-emergence herbicide recommended for the

control of annual weeds in many different crops. It is slowly hydrolyzed

in soils with a half-life of about 100 days in most soils.