A Manual of the Chemistry of the Carbon Compounds

THE CARBON COMPOUNDS. 439
large scale, and used in the place of benzoic acid in the manufacture
of aniline-blue.
a OxynapJUhoic Add CjgH^OHJCOgH is formed by action with
sodium and carbon dioxide on a naphthol. It is sparingly soluble
in water, and crystallizes in needles which are grouped in stars,
and melt at 186°. Its solution is coloured pure-blue by ferric
chloride.
/9 OxynapJUhoic Acid is not so readily formed ; it crystallizes like
the a acid, and gives with ferric chloride a blackish-violet colour.
Naphthalene-Ucarhnic Adds O^H^COgH)^.—The nitriles of these
acids, which are isomeric with naphtualic acid (page 437), are produced
by distilling the potassium salts of the different modifications
of naphthalene-bromosulphonic, and disulphonic acids with potassium,
cyanide. The nitrile from bromonaphthalenesulphouic acid yields a.
naphthalene-bicarbonic acid, which is almost insoluble in water, and
crystallizes in microscopic needles, melting at 240°.
The other modifications have been but little studied.
NAPHTHYL-PHENYMUHTHANE CH8
This hydrocarbon has been prepared by heating a mixture of
benzyl chloride and naphthalene with zinc ; it forms brilliant needles,
melting at 64°.
a NapUhyl-phewyl Ketmie CO -I ~ 6 J| is produced by heating a
mixture of benzene, a naphthoic acid, and phosphorus pentoxide. It
crystallizes in short prisms, melting at 75°*5.
0 Naphthylplienyl Ketone has been obtained by the same reaction
from jS naphthoic acid. It forms tufts of white needles, melting
at 82°.
A mixture of these two ketones is also formed by heating
naphthalene with benzoic acid and phosphorus pentoxide.
DlNAPHTHYLS C^H^
DimpUhyl k obtained by the action of sodium on brouwnaphthalene,
and together with phthalic acid by oxidizing naphthalene with
manganese dioxide and dilute sulphuric acid. It crystallizes in pearly
scales, melting at 154°.
Isodinaphthjl.—Thisisomerideis produced together with hydrogen,
by passing naphthalene repeatedly through a red-hot tube. It forms
brilliant plates, melting at 200°, and boiling above 300°; its alcoholic
solution exhibits a fine blue fluorescence.