What is the reaction of the following reagents with Thiophene? a) SO/Pyridine b) (CH3CO)2O/H3PO4
Understand the Problem
The question is asking for the chemical reactions involving thiophene when treated with specific reagents. It's seeking to understand what products result from the reactions with sulfur trioxide in pyridine and acetic anhydride in the presence of phosphoric acid.
Answer
SO/Pyridine sulfonates thiophene; (CH3CO)2O/H3PO4 acetylates thiophene.
a) SO/Pyridine is likely to sulfonate the thiophene, introducing a sulfonic acid group. b) (CH3CO)2O/H3PO4 will acetylate thiophene, adding an acetyl group. Both reactions involve electrophilic substitution, where the thiophene ring remains intact.
Answer for screen readers
a) SO/Pyridine is likely to sulfonate the thiophene, introducing a sulfonic acid group. b) (CH3CO)2O/H3PO4 will acetylate thiophene, adding an acetyl group. Both reactions involve electrophilic substitution, where the thiophene ring remains intact.
More Information
Thiophene, a sulfur-containing heterocycle, is stable and undergoes electrophilic substitution reactions due to the electron-rich nature of its π-system.
Tips
A common mistake is not recognizing the types of electrophilic substitution reactions when dealing with heteroaromatic compounds like thiophene.
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