Indian Forest Service (Mains), Chemistry optional · 2025 · Paper II
Q3(c). Erlenmeyer–Plöchl azlactone synthesis
Question
Complete PhCHO + CH₃CONHCH₂COOH with Ac₂O/NaOAc and give a mechanism.
Answer in brief
The product is 4-benzylidene-2-methyl-1,3-oxazol-5(4H)-one, an azlactone.
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CoversErlenmeyer–Plöchl azlactone synthesisazlactoneN-acetylglycineoxazolonePerkin-type condensation
All parts of Question 3
- 3(a) Stevens rearrangements of two ylides10 marks
- 3(b) Knoevenagel condensation10 marks
- 3(c) Erlenmeyer–Plöchl azlactone synthesis10 marks
- 3(d) Regioselective ketone alkylation10 marks