77965-69-6Relevant articles and documents
Mechanism of the Fujiwara Reaction: Structural Investigation of Reaction Products from Benzotrichloride.
Uno, Toyozo,Okumura, Kazuo,Kuroda, Yoshihiro
, p. 3175 - 3178 (1981)
The mechanism of color development and the structures of chromophores of the Fujiwara reaction have been investigated by using benzotrichloride as a chromogenic reagent.Two products were isolated.NMR and mass spectroscopic investigation indicates that one of them is N2--N1-(1,3-butadienyl)benzamidine and that the other is N-benzenecarboxamide.In alkaline media, the former develops an intense red color; the latter becomes yellow.The formation of these chromophores is explained by the hydrolytic scission of pyridine rings in the benzal dipyridinium cation intermediate.