Tetraphenylhydrazine, decomposition

Diphenylamine is only slowly converted even at higher temperatures (50% water 50% t-butanol, O.IM KOH, 50 °C) and there it yields thermal decomposition products, that possibly originate from tetraphenylhydrazine . ... 

A photometric method of analysis was used to determine the rate of thermal dissociation of tetraphenylhydrazine" in benzene at 65 to 85 °C, based on the fast reaction between the (CgH5)2N radical and l,l-diphenyl-2-picrylhydrazine forming the intensely coloured l,l-diphenyl-2-picrylhydrazyl radical. The first order rate constant for decomposition hk = 6.15x 10 exp(—28,040/Jir)sec" . In an independent study of the same reaction the activation energy and heat of dissociation for the above dissociation have been determined by an optical method to be 29.2 kcal.mole and 23.5+2 kcal respectively. 

There have been very few reports of azide decompositions induced by radicals. It has been found that the decomposition of phenyl azide was accelerated by thiyi radicals, particularly when it was carried out in thiols as solvents in the presence of free radical sources, such as tetraphenylhydrazine, hexaphenylethane and triphenylmethyl hydroperoxide When the decomposition was carried out in thiophenol, the major product was aniline, along with a small amount of o-aminodiphenylsulphide (232)... 

Recombination of Aminyl Radicals. A convenient source of In is tetraphenylhydrazine, Inin. Diphenylamine and oligomeric semidienes were found to be the products of Inin decomposition at T > 400°K 0,4). The kinetics of their formation were studied by Varlamov (5). He found that InH and o-semidienes were primary stable products of... 

The reactions of phenylamide derivatives of ytterbium with Ph GeBr have been carried out. After hydrolysis of the reaction products hexaphenyldigermane has been isolated which, in the authors opinion, proves the presence of R2NYbI in the initial solution. The decomposition of this iodid/amide, which readily proceeds in the presence of ketones or Ni and Co salts, gives tetraphenylhydrazine [28]. 

---

See also in sourсe #XX -- [ ]

---