ClCHCHCl

ClCHCHCl is a shorthand structural representation that corresponds to 1,2-dichloroethene, an organochlorine compound with the formula C2H2Cl2. The molecule features a carbon–carbon double bond with one chlorine substituent on each carbon, giving rise to two stereoisomers: cis-1,2-dichloroethene, where the chlorine atoms are on the same side of the double bond, and trans-1,2-dichloroethene, where the chlorines are on opposite sides.

Structure and naming: The core framework is an ethene backbone (C=C) with chlorines attached to each carbon. A common explicit representation is CHCl=CHCl, which emphasizes the vinyl nature and the identical substituents on both carbons. The two isomers are examples of geometric isomerism (cis/trans, or Z/E in some conventions).

Properties: 1,2-Dichloroethene exists as colorless liquids or gases at ambient conditions, with physical properties that differ between the cis and trans isomers. The isomers have distinct boiling points and densities, reflecting their different shapes and intermolecular interactions. Like many chlorinated hydrocarbons, they are relatively reactive under certain conditions and can participate in various chemical transformations.

Production and uses: These compounds are produced for use as intermediates in the synthesis of other chlorinated organic chemicals and as reagents in organic synthesis. They are typically handled in controlled industrial settings, with attention to safety and regulatory requirements due to toxicity and environmental considerations.

Safety and handling: 1,2-Dichloroethene is hazardous; exposure can irritate the eyes, skin, and respiratory system. It is generally flammable and should be managed with proper ventilation, containment, and personal protective equipment. Environmental releases should be prevented and treated according to relevant regulations.

See also: 1,2-dichloroethene (cis- and trans-), vinyl chloride, stereoisomerism in alkenes.