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To a solution of 43.6 g of sodium hydroxide in 150 ml of methanol heated to reflux, 200 g of gamma-undecalactone was dropped in. After stirring for 2 hours at reflux, the mixture was cooled to room temperature and evaporated to dryness. The resulting crystals were washed with hexane to yield 240 g of colorless crystals.

1. temperatureto reflux
2. temperatureat reflux
3. customevaporated to dryness
4. washThe resulting crystals were washed with hexane