The Methylation of Para Aminophenol By Means of Formaldehyde
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It separates from solution in crystalline form, the color of the crystals de- pending upon the presence of impurities in the solution. The pure secondary base yields nearly white, or gray, minute needles, having a low solubility in cold water. When precipitation is effected from solution containing p-aminophenol, formation of the nitrosamine is noticeably delayed, due no doubt to the superior reactivity of the primary base. In such cases, also, tar- formation is almost invariable, and the nitro...samine separates as brown granular crystals. Under unfavorable conditions the separation of tar has been considerable, rendering purification of the nitro- samine, without considerable loss, impossible.
The nitrosamine is a somewhat unstable compound, and suf- fers serious decomposition, with darkening, if an attempt is made to dry it while moist with any trace of the acid mother- liquor, or to crystallize it from strong alcohol ; less extensive de- composition occurs if dilute alcohol is used. Rather oddly, the compound seems to be most satisfactorily crystallized from hot water, in which it is moderately soluble.
What to read after The Methylation of Para Aminophenol By Means of Formaldehyde?
You can find similar books in the "Read Also" column, or choose other free books by Ernest Carl Wagner to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It separates from solution in crystalline form, the color of the crystals de- pending upon the presence of impurities in the solution. The pure secondary base yields nearly white, or gray, minute needles, having a low solubility in cold water. When precipitation is effected from solution containing p-aminophenol, formation of the nitrosamine is noticeably delayed, due no doubt to the superior reactivity of the primary base. In such cases, also, tar- formation is almost invariable, and the nitro...samine separates as brown granular crystals. Under unfavorable conditions the separation of tar has been considerable, rendering purification of the nitro- samine, without considerable loss, impossible.
The nitrosamine is a somewhat unstable compound, and suf- fers serious decomposition, with darkening, if an attempt is made to dry it while moist with any trace of the acid mother- liquor, or to crystallize it from strong alcohol ; less extensive de- composition occurs if dilute alcohol is used. Rather oddly, the compound seems to be most satisfactorily crystallized from hot water, in which it is moderately soluble.
What to read after The Methylation of Para Aminophenol By Means of Formaldehyde?
You can find similar books in the "Read Also" column, or choose other free books by Ernest Carl Wagner to read onlineMoreLess
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