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Synthesis of alkyl-, acetyl-, and nitro-coumarin derivatives. Reagents and conditions: (a) acetic anhydride, pyridine, rt, ultrasound irradiation; (b) allyl bromide, geranyl bromide, or prenyl bromide, K2CO3, acetonitrile, and reflux; (c) HNO3/AcOH, 0–5°C for 30 min and then 90 min at rt.
