Chlorodiiodomethane is a trihalomethane with the chemical formula .

Toxicity It is an environmental pollutant and, like other iodine-containing trihalomethanes (except iodoform), is less cytotoxic than the corresponding iodocarboxylic acids.

Chemical properties It reacts with sodium hydroxide in the presence of a phase transfer catalyst to produce chloroiodocarbene, which can be added to olefins to produce 1-chloro-1-iodocyclopropane derivatives.

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