Pentanal → 2-Propylhept-2-enal

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A reactor equipped with a dropping funnel and a condenser was charged with 20 g (0.5 mol) of sodium hydroxide (manufactured by Kanto Chemical Co., Inc.) and 500 mL of water. 2434 g (28.3 mol) of n-pentanal (“Valeraldehyde” manufactured by Tokyo Chemical Industry Co., Ltd.) was added dropwise to the mixture from the dropping funnel over 3.5 hours while stirring the mixture at 80° C. The mixture was stirred at 95° C. for 2 hours, and the aqueous layer was removed from the reaction product. The reaction product was purified by distillation (b.p.: 70° C./0.7 kPa) to obtain 1930 g of 2-propyl-2-heptenal.

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