What is "triphosgene"

n. (context organic compound English) The organic compound ''bis(trichloromethyl) carbonate'' (CCl₃-O)₂CO that is used in organic synthesis

Triphosgene (bis(trichloromethyl) carbonate (BTC), CClO) is a chemical compound that is used as a safer substitute for phosgene, because at room temperature it is a solid crystal, as opposed to phosgene which is a gas. Triphosgene crystals decompose above 200 °C