Silver perchlorate, decomposition

Silver perchlorate forms solid complexes with aniline, pyridine, toluene, benzene and many other aromatic hydrocarbons [1], A sample of the benzene complex exploded violently on crushing in a mortar. The ethanol complex also exploded similarly, and unspecified perchlorates dissolved in organic solvents were observed to explode [2], Solutions of the perchlorate in benzene are said to be dangerously explosive [3], but this may be in error for the solid benzene complex. The energy released on decomposition of the benzene complex has been calculated as 3.4 kJ/g, some 75% of that for TNT [4],... 

Methylene dichloride [6] and perchloric acid [7] were purified and dosed as described. Silver perchlorate (BDH) was treated in vacuo for a few hours before use. 1-Phenylethyl bromide (Eastman-Kodak) was fractionally distilled under high vacuum and the middle fraction was collected into breakable phials since this compound undergoes a slow decomposition, yielding hydrogen bromide and styrene, when kept in bulk, solutions of it in methylene dichloride were prepared from the original phials by the tipping technique [7]. Styrene was purified [8], dried, and stored [9] as described. Shortly before use it was vacuum-distilled into breakable phials from a microburette. 

Silver perchlorate, AgC104.—The monoxide dissolves in perchloric acid, forming the perchlorate. It is also produced by double decomposition from barium perchlorate and silver sulphate. The unstable, deliquescent salt melts at 486° C., and decomposes at higher temperatures. 

There may be simultaneous or preliminary dehydration processes for hydrated salts. Group 1 metal perchlorates, as well as calcium, barium and silver perchlorates [59] are represented by reaction (2.13). Aluminium and iron(IIl) perchlorates are represented by reaction (2.14). The solid product of decomposition of magnesium perchlorate is a mixture of magnesium oxide and magnesium chloride. 

HAZARD RISK Dangerous fire hazard when exposed to heat or flame contact with strong oxidizers may cause fire vapors may flow to distant ignition sources and flash back forms explosive mixtures with powdered sodium or phosphorus trichloride and sodium violent reaction with silver perchlorate and dimethyl sulfoxide closed containers exposed to heat may explode decomposition emits toxic gases of hydrogen chloride, phosgene, carbon monoxide, carbon dioxide NFPA Code H 2 F 3 R 0. 

EXPLOSION and FIRE CONCERNS flammable liquid NFPA rating Health 2, Flammability 3 Reactivity 1 dangerous fire hazard when exposed to heat or flame reacts violently with hydrogen and Raney nickel catalyst violent reaction with silver perchlorate forms an explosive reaction with nitnc acid and perchloric acid forms explosive mixtures with decaborane and tnethynylaluminum incompatible with sulfur trioxide forms explosive peroxides when exposed to air decomposition emits carbon monoxide and carbon dioxide vapors are heavier than air and may travel to ignition source and flash back use water spray, dry chemical, foam, or carbon dioxide for firefighting purposes. 

Perchlorates with a marked exothermic decomposition, for example silver perchlorate which gives — A// = 22,3 kcal/mol. Silver perchlorate po.sscsses explosive properties (Vol. Ill, p. 232). 

A simple conversion of 3-norcarene into trans-bishomobenzene has been discovered. The method involves reaction of (693), itself obtained in two standard steps from 3-norcarene, with Bp3,OEt2. Silver perchlorate-catalysed decomposition of (693) gave 2,3-homotropilidene quantitatively. 

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