Cas Number


Other Names


The formula



Triphosgene (bis(trichloromethyl) carbonate (BTC), C3Cl6O3) 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.

Physical and Chemical Properties
Molar mass 262.29 g·mol−1
Appearance White Solid
Density 1.1 g cm−3, solid
Melting point 80 °C (176 °F; 353 K)
Boiling point 377 °C (711 °F; 650 K)
Solubility in water Insoluble
Solubility organic solvents
Acidity (pKa) 7.64[1] (pKa of conjugate acid in acetonitrile)
Magnetic susceptibility (χ) -166.8·10−6 cm3/mol,
Refractive index (nD) 1.59; εr, etc.

TPP is a highly efficient product that serves successfully in many applications, for example: in vitamin synthesis and production of pharmaceutical active ingredients, crop protection products and coatings. a co-catalyst in isobutanol and n-butanol production.

3. as an initiator of several polymerization reactions.

4. as an oxidation and UV stabilizer in plastics.