. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . Blue as typical of these compounds, thereactions occurring may be represented as follows:— \ > ^ST \/ nha nh The formation of indamines or indophenols from nitrosoaminesor nitrosophenols can also be represented in a similar manner: xxv] Congress of Applied Chemistry 465 O —> k,1 -^ Li o OH / 0 7°H «>l(0M>.<VUNfcM,V ^^N(<;HlV * \jlyu» otf^Li. dM^s -t£*-<-e^_) The tendency of the triphenylmethane dyestuffs to formcolourless compounds by combination with sulphurous
. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . Blue as typical of these compounds, thereactions occurring may be represented as follows:— \ > ^ST \/ nha nh The formation of indamines or indophenols from nitrosoaminesor nitrosophenols can also be represented in a similar manner: xxv] Congress of Applied Chemistry 465 O —> k,1 -^ Li o OH / 0 7°H «>l(0M>.<VUNfcM,V ^^N(<;HlV * \jlyu» otf^Li. dM^s -t£*-<-e^_) The tendency of the triphenylmethane dyestuffs to formcolourless compounds by combination with sulphurous acid,hydric cyanide, water, etc. has been represented by Thiele asfollows:— O ) I Most of the reactions which lead to the dyestuffs of the tri-phenylmethane group are in my opinion better explained asaddition processes than by the ordinary method of the formation of pararosaniline by oxidation of a mixtureof paratoluidine and aniline may be represented by assumingthat the former is first oxidised to the carboquinonimide whichthen reacts with aniline in the following manner:—. The hydrol and phosgene syntheses of triphenylmethanedyestuffs may also be regarded in a similar light. Thus theextraordinary facility with which tetramethyldiamidobenzhydrolundergoes condensation with a wide range of substances isexplained if we regard these reactions as due to the additivecapacity of the hydrol salt in its quinonoid form: 466 Original Communications: Eighth International [vol. Even the phenylation of rosaniline in the production ofAniline Blue may be regarded with great probability as a quino-noid reaction, though of a different type to the above:
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