Carbonyl bromide fluoride metals

EXPLOSION and FIRE CONCERNS noncombustible liquid nonflammable gas NFPA rating (not rated) contact with chemically-active metals (such as potassium (K), sodium (Na), calcium (Ca), powdered aluminum (Al), zinc (Zn) and magnesium (Mg)) will cause fires and explosions contact with flames and/or hot surfaces will emit hydrogen bromide, hydrogen fluoride, free bromine, and small amounts of carbonyl halides product is relatively toxic to humans at levels below fire extinguishing concentration product will not extinguish fires resulting from contact with chemically-active metals use water spray to cool cylinders involved in fires use media suitable for flammable materials in area. 

As mentioned in the chapter on the reaction mechanism, the anion, especially of Ni-salts, is important in affecting the reaction course. The catalytic efficiency of the nickel halides strongly increases in the series fluoride, chloride, bromide, iodide [374—376]. The molar ratio of cobalt or nickel to iodine is also very important [414]. As in the hydroformylation reaction, metal carbonyls substituted by phosphine ligands are very reactive [377, 1009], and especially modified rhodium and palladium catalysts [1021, 1045] allow reactions under mild conditions. Thus, the nickel bromide triphenylphosphine allyl bromide complex shows an increased reactivity in the carbonylation of acetylenes. On the other hand, carbonyls substituted by phosphine ligands are also readily soluble in the reaction mixture [345, 377]. 

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