This chapter discusses the biological activity of carbonyl difluoride (COF2). Carbonyl difluoride has a lower toxicological activity than phosgene owing to the greater stability of the C–F bond relative to C–Cl. The effects of carbonyl difluoride on the respiratory system are discussed in the chapter. It also presents numerous reports of toxic effects caused by the thermal decomposition of poly(tetrafluoroethene), PTFE. The chapter presents the analytical methods for the determination of carbonyl difluoride. Carbonyl difluoride is not manufactured on any sort of large scale so that direct industrial emissions of the gas need not be considered as far as the environmental issues are concerned. COF2 has a potential industrial utility as a fluorinating agent under conditions where the cheaper and abundantly available hydrogen fluoride is ineffective. Hydrogen fluoride is the most common, accessible, and active fluorinating agent and its interaction with phosgene is known to generate carbonyl difluoride. Thermodynamic and physical properties of COF2 are discussed in the chapter. At room temperature and atmospheric pressure, carbonyl difluoride is a colorless gas that is condensable to give a colorless liquid. The mass spectrum (electron energy not specified) of COF2 has been recorded via an unreactive Kel–F inlet system .
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