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  In a 500ml three-necked flask equipped with a stirrer, dropping funnel and thermometer, add 140ml formic acid and 56g urea-peroxide adduct, stir and dissolve. 28 g (0.17 mol) of 2-hexylcyclopentanone was added dropwise at room temperature, and the dropwise addition was completed in about 1 hour. 168 ml of water was added, and the layers were stirred and separated. The aqueous layer was extracted three times with 28 ml of toluene, and the organic Chemicalbook layers were combined. The toluene in the organic layer was distilled off under reduced pressure, and the temperature was controlled not to exceed 70° C. The residue was the crude product of butyl-undecalactone with a purity of 85% and a yield of 96%. The crude product was distilled with a vacuum thin film distillation device, at 128° C/1.4 kPa, and the distilled product was butyl-undecalactone,  purity 98% ,yield 84%.;

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