Sulfonic acid is
a compound with general formula RSO2OH, where R is an
aliphatic or aromatic hydrocarbon. It is a derivative of sulfuric acid
(HOSO2OH) where an OH has
been replaced by a carbon group or a compound where a hydrogen atom has been
replaced by treatment with sulfuric acid; for example, benzene is converted to
benzenesulfonic acid (water-soluble). Sulfonic acid has a sulfur atom bonded to
a carbon atom of a hydrocarbon and bonded also to three oxygen atoms, one of
which has been attached to a hydrogen atom.
Sulfonic acid is acidic due to the
hydrogen atom, stronger than a carboxylic acid. Sulfonic acid is one of the most
important organo sulfur compounds in organic synthesis. Sulfonic acids are used
as catalysts in esterification, alkylation and condensation reactions.
Sulfonates are salts or esters of sulfonic acid. Sulfonic salts are soluble in
water. Sulfonic acid and its salts present in organic dyes provide useful
function of water solubility and or improve the washfastness of dyes due to
their capabiltity of binding more tightly to the fabric.
They are widely used in
the detergent industry. Alkylbenzene sulfonic acid is the largest-volume
synthetic surfactant because of its relatively low cost, good performance, the
fact that it can be dried to a stable powder and the biodegradable environmental
friendliness. Sulfonate cleaners do not form an insoluble precipitates in hard
water. Sulfonic acid salts and esters are intermediates widely used in organic
synthesis and particularly phenolic compounds and cation exchange resins. They
are synthetic intermediates for a number of biologically active compounds and
pharmaceutical candidates such as sulfa drugs.
Benzenesulfonic acid consumption is linked mostly to phenol and
resorcinol production with
sodium hydroxide. It is used as a catalyst for dehydration and used in
solidifying resins. It is a base material for electroplating solutions.
Benzenesulfonic acid, or a derivative thereof, is used as a synthetic
intermediate for a number of chemical families of pharmaceuticals, pesticides,
dyes, pigments, fluorescent brighteners, and other organic compounds. Commercially, benzenesulfonic acid sodium salt is more common due to high
deliquescence of the base material.
3-Nitrobenzenesulfonic Acid Sodium Salt is used as an intermediate for dyes and
fluorescent brightening agent. It is used as
an developing agent for electroplating and auxiliary for dying fabrics.
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The prefix nitro- indicates the presence of NO2- radical, while nitrate refers
to any salt or ester of nitric acid or the NO3- anion. Nitroso- is the prefix
indicating presence of the group -NO and azo- is for -N=N- group. Some range of
organic compounds containing nitrogen include nitro compounds (RNO2 ), nitroso
compounds (RNO), amines (R3N ), amino acids, and natural alkaloids or
nucleotides. The nitrogen ion in nitro compounds is trigonally planar with 120°
angles. There are two resonance bonds so that the two oxygens are equivalent.
Nitro compounds are strongly basic due to electron withdrawing both inductively
and mesomerically. Historically, they
are abundant in dyes and explosives. Nitro compounds, organic hydrocarbons having one or more NO2
groups bonded via nitrogen to the carbon framework, are versatile intermediate
in organic synthesis.
- Michael
addition
- Reduction
- Henry
Reaction (Nitro-aldol reaction)
- Nef
reaction
- O-Alkylation
- Cycloaddition
- Substitution, Elimination, Conversion
reaction
- Alkylation,
Acylation, and Halogenation
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