1-Chloronaphthalene

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1-Chloronaphthalene is a chlorinated version of naphthalene (an aromatic hydrocarbon) with the formula C10H7Cl. It is an isomer of 2-chloronaphthalene and appears as a colorless, oily, nonpolar liquid.

How it’s made:
It is produced by chlorinating naphthalene. The reaction also forms other chlorinated derivatives, such as dichloro- and trichloronaphthalenes.

Uses:
- A powerful biocide; it can also act as an insecticide and fungicide in the timber floors of shipping containers, similar to chlordane.
- Historically used as a solvent for oils, fats, and DDT up to the 1970s.
- Used to determine the refractive index of crystals by immersion.

Safety:
- Toxic and harmful if swallowed; harmful to aquatic life with long-lasting effects. Handle with appropriate safety precautions.