Pentanal → Cyclopentanone, 2-(1-hydroxypentyl)-

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Valeraldehyde having an acid value of 4.2 mg-KOH/g was used as the starting material. 719 g (8.55 mol) cyclopentanone, 320 g water and 3.5 g (0.042 mol) 48% NaOH were introduced into a 2-L four-necked flask, then the mixture was cooled to 15° C. under stirring, and 319 g (3.70 mol) valeraldehyde was added dropwise at the same temperature over 5 hours. Thereafter, the mixture was stirred at the same temperature for 2 hours. After the reaction was finished, the mixture was neutralized and analyzed in the same manner as in Example 1. The result indicated that the reaction mixture contained 557 g (3.27 mol) 2-(1-hydroxy-n-pentyl)cyclopentanone (yield 89.0%) and 6.8 g (0.044 mol) 2-pentylidene cyclopentanone.

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