It is used as a
stabilizer for unsaturated polyesters and as an antioxidant for
fatty esters, linseed oil, and other nonfood fats and oils..
It is used as a stabilizer to inhibit peroxide formation in
ethers, chlorinated hydrocarbons and ethyl cellulose. It is also used as an intermediate to manufacture other stabilizers,
dyes, pharmaceuticals and plasticizers.
is a group of aromatic compounds containing two opposite
carbonyl groups (C=O) and the other two pairs of
carbon atoms linked by vinylene group(-CH=CH) in a six-membered
unsaturated ring. The carbonyl groups are located in
different rings and form various chemical structures
which offer important roles to colours. Quinones are
used in photography and dye manufacture. Quinones occur
benzoquinones, naphthoquinones, anthraquinones, and
polycyclic quinones. Though quinones are found in plants
and in a few animals, they usually are prepared by oxidation
of aromatic amines, polyhydric phenols, and polynuclear
hydrocarbons.The reduction of quinone to the corresponding
dihydroxy form is an important characteristic reaction.
In acidic solution, p-benzoquinone is reduced reversibly
to hydroquinone. The so-called quinhydrone electrode,
containing equimolar solution of quinone and hydroquinone,
is used to determine hydrogen ion concentrations depends
on the oxidation-reduction reactions. Hydroquinone and
its derivatives used principally in photographic dye
chemicals, in medicine, as an antioxidant, and in paints,
varnishes, and motor fuels and oils. Hydroquinone
and certain derivatives are also used as polymerization
inhibitors by direct reacting with peroxy-free radical
to tie up free radicals.