A Manual of the Chemistry of the Carbon Compounds

THE CASBON COMPOUNDS. 199
CHg ( /->TT CH».SO».OH
^
and its sodium salt has also been obtained by boiling a solution of
sodium sulphite with sodium monochloracetate:—
I +SOJ£ a =| + ClNa
CO.ONa l m CO.ONa
When sulphacetic acid is heated with sulphur trioxide it is converted
into methimic add or methenedisulphonic acid:—
'* _ _ (SO TT
This acid is of course also formed when acetaraide or acetonitrile
are heated with a large excess of fuming sulphuric acid.
Metbionic acid is the lower liomologue of ethenedisulplionic acid
(see Etliene Compounds), and is the second member of a series of
sulphonic acids, which may be considered as substitution-products of
marsh-gas, the first being mcthylsulpJwnic add CH^SOgH, a compound
formed by the oxidation of methyl mercaptane, and the
third is methenyltrmdplumie acid, a compound already described (see
page 103) :—
Methylsalplionic Acid. Methonediralphonic Acid. MothonyltriBnlphonic Acid.
CHSOH CH2(s6aH)a CH(S08H)8
GLYCOLLTC AMIDES.
CH^OH
Qlycollamide | is produced by the action of dry ammonia
CO.NH.
uponglycollide or ethyl glycollate. It is soluble in water, crystallizing
in colourless crystals with a slightly sweet taste. It forms
very unstable salts.
Gh/cocol or Amidacetic Add I .—This compound, also called
CO-OH
glyeoeine, is formed by heating monochlor- or monobromncetic acid
with ammonia. It is a product of decomposition of glycocholic and
hippuric acids, and is also produced when glue is boiled with dilute
snlphutic acid. It forma large transparent crystals, possessing a
sweet taste. It is a weak acid, the copper-salt being the most
characteristic.
S