A Manual of the Chemistry of the Carbon Compounds

TUB CARBON COMPOUNDS. 399
It forms long, slender, silky needles, melting at 15)9°, and subliming
without decomposition,
Oitmylic Add C6H2-< [IQ g 8 -—This monobasic acid has been prepared
by boiling durene with dilute nitric acid. It is very sparingly
soluble in water, and crystallizes from an alcoholic solution in hud,
glistening needles or brilliant prisms, melting at 150°. It easily volatilizes,
and sublimes in slender needles.
Ciimidie Aeid'C6Vis { (co"^) is formed ' to g ftther wit h cumylic
acid. It is but sparingly soluble in water, and scarcely in benzene ;
and is obtained in long, transparent prisms by adding benzene to its
alcoholic solution. It sublimes at a high temperature without previously
melting.
DlMETHYMffTHYL-BEKZBNE, OK ETHYL-1BOXYLENR C6l :
Has been obtained by acting with sodium on a mixture of ethyl
bromide and monobroino-isoxylene. It is a colourless liquid, boiling
at 184°.
DIETHYt-BENZENE C6
Is formed by acting with sodium on ethyl bromide and ethyl-monobromobenzena
It boils at 179 s , and yields, on oxidation, ethylbenzoic
acid and terephthalic add.
METHYI--PHOPYI.-BENZENE
This compound is formed by the action of sodium on a mixture of
14 bromotoluene and propyl bromide. It boils at 179°, and yields
thick, oily nitro-compounds. Dilute nitric and chromic aoid oxidize
it to paratoluic acid and terephthalio aoid.
CYMENE, OK METHYL-18OPROPYL.BENZKNE C6H4 j rjHfCH ) '
Cymene has not been produced by synthesis, but occurs, together
with cuuiic aldehyde, in Koroan cumin-oil (Cvminum, Oymnvm), aad
in the oil of the water-hemlock (Ciettta virosa), and mixed with
thymol and a terpene in oil of thyme (Thytwus vulgaris), and the oils
of Ptychotis Ajmwn, and Mtmarda pundata, and other volatile oils.
Cymene has been obtained by abstracting two atoms of hydrogen