Acetylide, ethynide, dicarbide, or percarbide is the divalent anion with formula C22− or (C≡C)2−. It may be regarded as the result of removing two protons from acetylene C2H2 or H-C≡C-H, the prototypical alkyne — that behaves as a weak acid.
The hydrogen atoms in acetylene can be replaced by metallic elements to form acetylides ?e.g., acetylides of silver, copper, or sodium. The acetylides of silver, copper, mercury, and gold are detonated by heat, friction, or shock. In addition to its reactive hydrogen atom, the carbon ?carbon triple bond can readily add halogens, halogen acids, hydrogen cyanide, alcohols,...
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