Decomposition carbonyl bromide fluoride

The decomposition products of Halon 1301 are dangerous in sufficient concentrations. The chief ones are the acids of the halide components, HF, HBr, and Brj. Fluorine is too reactive to be present in substantial amoimts alone. Small amounts of carbonyl fluoride and carbonyl bromide (COFj and COBrj), respectively, have been found as well. Because of the potential for these toxic materials being present after the intervention of a Halon 1301 system in a fire, fire persormel and others entering the area of a fire should exercisecaution. Where the fire involves substantial amoimts of solid fuel, the use of a positive pressure, air-supplied breathing apparatus is recommended to search the area for injured personnel. 

This cyclization is a reaction developed by Mori, who carried out a series of investigations with tin reagent 33. Fluoride is a much more reactive anion for initiation than any of the other halides, although it often leads to decomposition of the starting materials. In the case of vinylic or aryl halogen compounds the iodides are easier to transform than the bromides, and chlorides are unrcactive. The carbonyl group can be derived from either an aldehyde or a ketone, and even esters are sufficiently electrophilic.22... 

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