A Manual of the Chemistry of the Carbon Compounds

342 TEE CHEMISTRY OF
•warm potash-solution with a red colour, and on cooling purple needles
of potassium cbloranilate crystallize out—
4K0H - C6Clj03| £! + 2KC1 + 2H «°
By decomposing this salt with sulphuric acid, oliloranilic acid is
obtained in small reddish-white plates, which, alter drying, assume
the colour of red lead, and dissolve in water with a violet colour.
C "NTTT
CMoranilamie Acid C0C120*2] Qg 2 —The ammonium salt of this
acid is obtained by dissolving choranil in ammonia. The free acid
crystallizes in almost black needles, having a diamond-lustie. By
heating it with dilute acids, it is converted into chloranilio acid.
f OH
Pyroeatechin, or Oxyplwnic Add C0H4 i Q£.—This second dioxybenzene
is found amongst the products of the distillation of wood,
and in several vegetable extracts, such as " Hno," " catechu," &c.;
and has also been found, but ia small quantity only, in the green
leaves of the Virginian creeper. It is also produced by heating
oxysalicylic acid:—
COHJ CO.OH » co _ r jT 10CH3 ^ -n
It is a colourless liquid, boiling at 205°, aad possessing an aromatic
smell. By heating it with concentrated hydriodic acid> it is resolved
nto methyl iodide and pyroeatechin.
Jtcsordn €H41 Q-^.—This body is formed by fusing several resins
or gum-resins (as galbanuin), or extract of sapan-wood and other