Ueber die Einwirkung von Diphenyltetrazochlorid auf Acetessigsäure und Benzaldehydphenylhydrazon

Abstract

W e d e kind, Einw. B. Diphenyltdrazochlorkd a. Acetessigs. etc. 219 0,1732 g, im Toluolbade getrocknet, gaben 0,4325 COB und 0,0890 GO,

The Chemistry of Formazans and Tetrazolium Salts

“…The condensation of tetrazotized benzidine with ethyl acetoacetate in dilute potassium hydroxide solution was studied by Wedekind (190). The product was said to be ethyl cycloformazylformate (LVIIa), but a subsequent paper (186) claimed that cycloformazyl methyl ketone (LVIIb) was produced.…”

“…Recent reinvestigation of the problem (200) has shown that the product is non-homogeneous and has a molecular The properties of his product, however, were not the same as those of the compound recently obtained from the condensation of diazotized 4-aminobiphenyl and the same phenylhydrazone (2, 100). The formazan LX (table 21), which might be expected from Wedekind's reaction, which was said to have given LVII, was actually prepared from tetrazotized benzidine and phenylglyoxylic acid phenylhydrazone (186).…”

The Stereochemistry of Diphenyls and Analogous Compounds.

“…To these compounds3 the original discoverers assigned formulas VI, 2 Conditions necessary for optical activity are clearly defined by Barker and Marsh (6a). 3 There were other cyclic derivatives described in the literature such as thiocarbonyl and carbonyldianisidine (162), carbonyl-o-tolidine and oxalyl-o-tolidine (170), cycloformazyl methyl ketone (190), malonylbenzidine (140), and p-nitrobenzylidene benzidine (7). VII, VIII, IX, and X.…”