Aluminium bromide phosgene

Chlorobromophosgene is formed by the action of aluminium bromide or boron bromide on phosgene at 140° C. ... 

Preparation by partial demethylation of 2-hydroxy-2, 4,4 -trimethoxybenzo-phenone or 2,2, 4,4 -tehamethoxybenzophenone with aluminium chloride or aluminium bromide in chlorobenzene at 90-95° (good yield). The same result is obtained using ethylene dichloride or nitrobenzene as the solvent [655], Preparation by reaction of phosgene with resorcinol dimethyl ether in the presence of aluminium chloride [215]. 

Phosgene can be used as the starting material for the preparation of other potentially useful carbonyl halides and carbonyl pseudohalides. Reaction of phosgene with fluorspar, for example, gives COCIF (see Section 9.1.1 and Chapter 16). With aluminium(III) bromide, COBrj is formed (Section 9.1.2.6). Reaction of COClj with HF gives COFj (see Section 9.10.4 and Chapter 13), reaction with silver cyanide gives carbonyl dicyanide, CO(CN)j (Section 9.1.7), whereas reaction with a mixture of sodium fluoride and HCN gives the mixed carbonyl halide pseudohalide, COFCN (Section 9.1.7 and Chapter 13). The chemistry of these... 

The treatment of aluminium(III) bromide with an excess of phosgene at salt-ice temperatures gives an initial lively reaction which, upon warming to 15 "C, proceeds in a vigorous second stage to give COClBr [2127] ... 

Early attempts by Besson to prepare COBr by the reaction between CO and Br, by oxidation of CHBr3 or CCl Br with ozone, and by treating phosgene with aluminium(III) bromide were unsuccessful [184], but COBr, was claimed to be formed in the reaction... 

It is also interesting to note that the mixed carbonyl halide, COBrCl, has been prepared by the reaction of phosgene with aluminium(III) bromide (see Section 9.1.2.6) [2127] ... 

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