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was cooled to room temperature, hot EtOH (5 mL) was added,
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removed from the reaction mixture by magnetic separation.
The ethanolic solution was evaporated, the residue was poured
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off and recrystallized from ethanol to afford pure coumarin.
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Georg Thieme Verlag Stuttgart · New York — Synlett 2015, 26, 1263–1268