Sulfonation is a reversible reaction that produces benzenesulfonic acid by adding sulfur trioxide and fuming sulfuric acid. The reaction is reversed by adding hot aqueous acid to benzenesulfonic acid to produce benzene.
What is sulfonation in organic chemistry?
Sulfonation: A chemical reaction which introduces the sulfonic acid functional group (-SO3H) into a molecule. Sulfonation with sulfur trioxide and sulfuric acid converts benzene into benzene sulfonic acid.
At which position of pyrrole electrophilic substitution reaction is most preferred?
Whereas attack at the β-position produces an intermediate that can be described by only 2 resonance structures. Therefore, the intermediate formed by α attack is more stable and the activation energy leading to it will be reduced. Consequently, electrophilic attack at the α position in pyrrole is preferred.
On which position electrophilic substitution takes place in pyrrole?
2nd position
Thus, when a pyrrole undergoes electrophilic aromatic substitution, substitution occurs at the 2nd position of the pyrrole.
What is sulfonation and sulfation?
Sulfonation and sulfation are two important chemical processes used in many industries to add a sulfur-containing group to an organic compound. The main difference between sulfonation and sulfation is that sulfonation involves the formation of a C-S bond whereas sulfation involves the formation of a C-O-S bond.
What is the meaning of sulfonation?
The replacement of the hydrogen atom of an organic compound with sulfonic acid (-SO3H) functional group, often by the reaction with sulfuric acid at higher temperatures, is called Sulphonation. “The introduction of a sulfonic acid group into an aromatic compound is referred to as sulphonation.”
Why is pyrrole electrophilic substitution?
Benzene is not the only aromatic compound that can undergo electrophilic substitution reactions. Aromatic compounds such as pyridine and pyrrole can also undergo electrophilic substitution reactions with electrophiles.
Why electrophilic substitution in pyrrole takes place at the position 2 whereas it occurs preferentially at position 3 in pyridine?
The reason behind it is the more number of resonating intermediate structure are possible to accommodate the positive charge when electrophile attacks on 2nd position (three resonating intermediate structures) that makes the intermediate carbocation more stable while if electrophile attacks on the 3rd position then …
Why electrophilic substitution occurs at 2 and 5 positions in thiophene furan and pyrrole?
Pyrrole, thiophene, and furan gives electrophilic aromatic substitution reaction. These compounds are more reactive compared to benzene. That’s why the attack of electrophiles takes place at 2nd position in pyrrole, thiophene, and furan.
What is sulfonation used for?
Sulfonation and sulfation are major industrial chemical processes used to make a diverse range of products, including dyes and color intensifiers, pigments, medicinals, pesticides and organic intermediates.
Is sulfation same as sulfonation?
The distinction between the two is in the chemical structure of the product. In the sulfonation of an alkyl aromatic a carbon-sulfur link- age is obtained. In the sulfation of an alcohol, for ex- ample, a true half ester of sulfuric acid is formed with a carbon-oxygen-sulfur linkage.
What is Sulphonation example?
Important sulfonation procedures include the reaction of aromatic hydrocarbons with sulfuric acid, sulfur trioxide, or chlorosulfuric acid; the reaction of organic halogen compounds with inorganic sulfites; and the oxidation of certain classes of organic sulfur compounds, particularly thiols or disulfides.
