Reaction of phosgene with phosphorus halides

Phosgene reacts with phosphorus(V) chloride in an autoclave at 300-400 C to give tetrachloromethane, with a 60-70% conversion [899-901,903]  

This reaction has been adapted by pressurizing a mixture of CO and Cl, in the presence of a carbon catalyst (impregnated with iron and nickel chlorides) and a less than molar ratio of PCI 3 at 400 C, it produces CC1 in 48% conversion based on carbon monoxide and 96% based on PCI 3 [900,903]. The reaction sequences involved are  

The overall reaction is, in effect, the catalysed dismutation of phosgene (see also Chapter 8)  

The following related reactions have also been claimed in a patent [903]  

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