Aspirin retrosynthesis: one strategic bond, a shorter plan
Identify aspirin’s ester bond and work back to salicylic acid and an acetyl donor. Learn what makes the classical plan attractive.
Recognise the groups first
Aspirin is acetylsalicylic acid. Its carboxylic acid and phenolic acetate are distinct groups, so disconnecting every oxygen-containing bond in the same way is unhelpful. In the interactive structure, find both carbonyls before deciding which bond to remove.
The classical disconnection keeps the salicylic-acid ring skeleton and asks how the acetyl group was installed on the phenolic oxygen.
A conceptual forward route
Salicylic acid and acetic anhydride give the familiar O-acetylation plan, with acetic acid as a byproduct. Keeping the existing aromatic core avoids unnecessary ring-building steps. This is a manual strategic explanation, not an engine result or laboratory procedure.
Acetyl chloride can also be considered as an acetyl donor, but its reactivity and byproducts differ. A formally drawn route using acetic acid is generally a weaker practical option for a phenol. Equal search scores would not make these experimentally equivalent.
What a good student answer includes
State the target, selected bond, starting materials and reason for the preference. Explain how the proposed forward transformation rebuilds the target. Add numerical yield, reaction time or engine scores only when an actual experiment or tool output supports them. A short route still needs compatibility and literature checks.
