[OH-].[Na+].[CH2:3]([CH:7]([CH2:10][CH2:11][CH2:12][CH3:13])[CH:8]=[O:9])[CH2:4][CH2:5][CH3:6].C=O.C[CH2:17][O:18]CC>CO.O>[CH2:3]([C:7]([CH2:17][OH:18])([CH2:10][CH2:11][CH2:12][CH3:13])[CH:8]=[O:9])[CH2:4][CH2:5][CH3:6]
An aqueous solution of 1 N sodium hydroxide (150 mL) was added dropwise to a solution of 209 g of dibutylacetaldehyde (supplied from Aldrich) and 127 g of an aqueous solution of 35% formalin (supplied from Wako Pure Chemical Industries) in 1500 mL of methanol under ice cooling, and stirred at room temperature overnight. Then 2 L of ether and 2 L of water were added to the reaction solution, and the mixture was separated into two liquid phases. The organic layer was dried on sodium sulfate anhydrate and concentrated, to yield 248 g of the title compound.
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