1,2-Dichloroethylene
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cis-DCE, the Z isomer, is obtainable by the controlled chlorination of acetylene:
- C2H2 + Cl2 → C2H2Cl2
Industrially both isomers arise as byproducts of the production of vinyl chloride, which is produced on a vast scale. Unlike 1,1-dichloroethylene, the 1,2-dichloroethylene isomers do not polymerize.
trans-1,2-DCE has applications including electronics cleaning, precision cleaning, and certain metal cleaning applications.
Both isomers participate in Kumada coupling reactions. trans-1,2-Dichloroethylene participates in cycloaddition reactions.
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Safety and environmental concerns
These compounds have "moderate oral toxicity to rats".
The dichloroethylene isomers occur in some polluted waters and soils, as the decomposition products of trichloroethylene. Significant attention has been paid to their further degradation, e.g. by iron particles.