Dimethyl-p-phenylene diamine

The azastyryl dyes result from the condensation of 2-formylthiazolium salt either on N,N-dimethyl-p-phenylene diamine or aromatic nitroso derivative. 

When p-ethylaminobenzoate and N,N-dimethyl-p-phenylene diamine sulfate were similarly treated with the dibromosulfone (I) for 2 h, the yield was only 32% and 15% respectively (Figure 1). A possible explanation is that the nucleophilicity of these monosubstituted anilines is weaker than that of aniline while a Na2C03 1,4-HBr elimination reaction could be competing with the substitution reaction, leading to the lower yield (18). 

Sediment Trap hydrogen sulfide in sodium hydroxide sulfide reacts with AW-dimethyl-p-phenylene-diamine to from methylene blue. Colorimetry 0.01 pmol/gram NR Allen et al. 1994... 

Preparation of Bindschedler s Green.1—Dimethyl-p-phenylene-diamine (7 g.) and dimethylaniline (6 g.) are dissolved in a mixture of 40 c.c. of concentrated hydrochloric acid and 40 c.c. of water. Into the solution, which is kept cool in ice and is stirred mechanically or... 

Chloride, (H3C)2N.CGH4.N( N).Cl, mw 183.64, N 22.88% pale-yel crysts (from ale + eth), mp — puffs off at ca 130° sol in cold w in ale insol in eth decumpd by hot w. Hantzsch (Refs 1 2) prepd it hy the low-temp diazotization of N -dinethyl-p-phenyl-enediamine with Na nitrite, while Stolle (Ref 4) treated N,N-dimethyl-p-phenylene-diamine hydrochloride with amyl nitrite in alcoholic medium... 

In Fig. 12 (curves 1 and 2) the double peaked absorption maximum, 520 and 560 m a is shown, characteristic of the positive ion-radical of dimethyl-p-phenylene diamine (MejN—Ph—NHa)t (77), which was here obtained by adsorption of the vapor under high vacuum conditions (27, 78). The same interpretation is given to the absorption maximum 850 m/a for benzidine vapor, adsorbed on silica-alumina gel (curves 3 and 4), which does not appear on silica gel. The band of the benzidine ion-radical, obtained by photoionization in the rigid EPA solvent at - 180°C is situated at 885 m/x (76). The accompanying bands 760 and 450 seem to be intimately connected with that at 850 m/a. 

On the catalytically active silica-alumina oxygen, or air, reacts with the adsorbed cation radicals, e.g., those of iV-dimethyl-p-phenylene-diamine, already on staying at room temperature (48a). Irreversible oxygenated products and a presumed diamine-Oj complex are formed. 

Thus, p-dimethylaminoazobenzene yields aniline and dimethyl-p-phenylene-diamine on reduction —... 

Figure 8A. Stoichiometry of the reaction of III with dimethyl-p-phenylenediamine. Experiments carried out strictly at 0°C. to avoid decomposition of III. Milh-molar extinction coefficient of dimethyl-p-phenylene-diamine radical was 8.7 at 515 nifi...

The earliest tests used for this purpose were made with the Nadi reagent. This reagent consists of a mixture of a-naphthol and dimethyl-p-phenylene-diamine, which under the influence of certain oxidases is converted into a blue indophenol derivative. 

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