P-Aminophenol hydrochloride

Water at 125F/52C, 750.0ml p-Aminophenol hydrochloride, lOO.Og Potassium metabisulfite, 300.0 g Water to make 1.0 liter... 

Mix Solution A and allow to cool before adding Solution B. A precipitate of p-aminophenol hydrochloride will form. Place Solution A in an iced water bath and with continuous mixing slowly add 280.0 ml of Solution B. Then very slowly add additional Solution B until a sudden darkening in color takes place. Finally, add drop by drop, Solution B until only a few crystals remain. If this is done properly, the remaining crystals will dissolve in the working solution. In time, the developer will turn dark brown. However, the unused stock solution will last for several years. 

V-methyl-p-aminophenol. CH3NHC6H4OH. Properties Colorless needles. Mp 87C. Soluble in water, alcohol, and ether. Combustible. Derivation (1) Interaction of hydroquinone and me-thylamine (2) methylation of p-aminophenol hydrochloride. 

Mixtures of antibacterial agents (including ciprofloxacin hydrochloride) together with p-aminophenol (internal standard) in 0.1 M HC1 were... 

A wide range of toxins has now been investigated including the kidney cortical toxins mercury chloride, - p-aminophenol, " ifosfamide, the kidney medullary toxins propyleneimine and 2-bromoethanamine hydrochloride and the liver toxins hydrazine, allyl alcohol, thioacetamide and carbon tetrachloride. The testicular toxin cadmium chloride has also been investigated in detail. The aldose reductase inhibitor HOE-843 has also been studied. ... 

Amino-2-methylanthraquinone o-Aminophenol p-Aminophenol 2,4-Diaminoanisole sulfate trihydrate 2,4-Diaminophenol hydrochloride Disperse yellow 3 p-Methylaminophenol sulfate... 

Barium bromide photographic developer p-Aminophenol Ammonium sulfide m-Cresol Cresylic acid 2,4-Diaminophenol hydrochloride... 

C6H7N HCI Aniline hydrochloride C6H7NO 2-Acetyl pyrrole m-Aminophenol p-Aminophenol Pyridine-3-methanol C6H7NO y2H204S m-Aminophenol sulfate... 

Amino-4-methoxyphenol 141 4-Methoxy-2-(phenylazo)phenol (100 g) is dissolved in a solution of sodium hydroxide (100 g) in water (11), warmed on the water-bath, and treated, with stirring, with portions of sodium dithionite until the solution is decolorized. The aniline produced is extracted with ether, and the aqueous-alcoholic phase therefrom is neutralized, whereupon the aminophenol is precipitated. This is at once filtered off, dried, and immediately converted into its hydrochloride by ethereal hydrogen chloride. The yield is 57.5 g and the m.p. 205-212° (dec.). A further 7.8 g of somewhat lower m.p. are obtained by extracting the aqueous mother-liquor with ether, the total yield being 85 %. 

Ainino-2-hydroxyben2oic acid. This derivative (18) mote commonly known as 4-aminosahcyUc acid, forms white crystals from ethanol, melts with effervescence and darkens on exposure to light and art. A reddish-brown crystalline powder is obtained on recrystaUization from ethanol —diethyl ether. The compound is soluble in dilute solutions of nitric acid and sodium hydroxide, ethanol, and acetone slighdy soluble in water and diethyl ether and virtually insoluble in benzene, chloroform or carbon tetrachloride. It is unstable in aqueous solution and decarboxylates to form 3-aminophenol. Because of the instability of the free acid, it is usually prepared as the hydrochloride salt, mp 224 °C (dec), dissociation constant p 3.25. 

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