Meta-aminophenol is prepared by reducing metanitrophenol, or by heating resorcin with ammonium chloride and ammonia to 200° C. Dimethyl-meta-aminophenol is prepared by heating meta-aminophenol with methyl alcohol and hydrochloric acid in an autoclave; by sulphonation of dimethylaniline, the sulphonic acid formed being finally fused with potash; or by nitrating dimethylaniline, in the presence of sulphuric acid at 0° C. In the latter case a mixture of nitro-compounds is obtained which can be separated by the addition of sodium carbonate.
All four mono-hydroxyxanthones are known, and are prepared by heating salicylic acid with either resorcin, pyrocatechin or hydroquinone; they are yellow crystalline solids, which act as dyestuffs.
On fusion with caustic potash it decomposes with formation of tetrahydroxy-benzophenone, which then breaks up into resorcin and hydroquinone.
Thus potassium ortho-oxybenzoate is converted into the salt of para-oxybenzoic acid at 220 0; the three bromphenols, and also the brombenzenesulphonic acids, yield m-dioxybenzene or resorcin when fused with potash.
Resorcin on reduction gives dihydroresorcin, which G.
When heated with resorcin to 200° C. it gives trioxybenzophenone.
When heated with io% hydrochloric acid to 180° C. it yields resorcin (J.
Of resorcin gives a characteristic violet red coloration.
RESORCIN (meta-dioxybenzene), C 6 11 4 (OH) 2, one of the dihydric phenols.
Many ortho and, para-compounds of the aromatic series (for example, the brom-phenols, benzene para-disulphonic acid) also yield resorcin on fusion with caustic potash.
Vorlander); when fused with caustic potash, resorcin yields phloroglucin, pyrocatechin and diresorcin.
With concentrated nitric acid, in the presence of cold concentrated sulphuric acid, it yields trinitro-resorcin (styphnic acid), which forms yellow crystals, exploding violently on rapid heating.
In medicine, resorcin, which is official in the United States under the name of resorcinol, was formerly used as an antipyretic, but it has been given up. The dose is 2 to 8 grs.
Weak, watery solutions of resorcin (To or 15 grs.
Mono-acetyl resorcin, C 6 H 4 (OH) O 000H 3, is used under the name of "euresol."
A tetrabromresorufin is used as a dye-stuff under the name of Fluorescent Resorcin Blue.
Resorcin, the naphthols, alizarin, &c., or for preparing dye-stuffs in a more soluble form.
Merling (Ann., 1894, 278, p. 28) by reducing resorcin in hot alcoholic solution with sodium amalgam.
5 (phloroglucin) is obtained by the fusion of many resins and of resorcin with caustic alkali.
Unlike resorcin it does not give a fluorescein with phthalic anhydride.