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Reference.org
Triphosgene
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<p>Triphosgene (bis(trichloromethyl) carbonate (BTC)) is a chemical compound with the formula OC(OCCl3)2. It is used as a solid substitute for <a href="/facts/Phosgene/Adeazsck">phosgene</a>, which is a gas and <a href="/facts/Diphosgene/ft1PN1U9">diphosgene</a>, which is a liquid. Triphosgene is stable up to 200 °C. Triphosgene is used in a variety of halogenation reactions. </p>