Dihaloacetylenes

Dichloroacetylene (DCA) is an organochlorine compound with the formula . It is a colorless, pyrophoric, explosive liquid that has a sweet and "disagreeable" odor. Dichloroacetylene is neurotoxic, hepatotoxic, nephrotoxic and possibly carcinogenic.

Difluoroacetylene is a compound of carbon and fluorine having molecular formula . A linear molecule, its two carbons are joined by a triple bond and have terminal fluorines: . The molecule is the perfluorocarbon analog of acetylene, . Preparation of difluoroacetylene is difficult, with danger of explosions and with low yields. Nevertheless, the compound has been made, isolated, and characterized by various spectroscopical methods (MS, NMR, Photoelectron- and IR spectroscopy). The compound is of interest as a precursor to fluoropolymers containing double bonds, analogous to polyacetylene.

Dibromoacetylene is an organic compound with the chemical formula . It is a molecular chemical compound containing acetylene, with its hydrogen substituted by bromine. Its molecule is linear, with the structure .