Acetaldehyde → HCID 20043106, compound

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Reaction Steps

In a three-necked flask equipped with a mechanical stirrer and reflux condenser, ethanol is acidified to a pH of 0.5-1.5 with 8 percent methanolic HCl. To the cooled alcohol is added acetaldehyde. The addition is so conducted that the temperature of the mixture stays under 40° C. The solution is stirred at room temperature for 2 hours after the completion of addition. The mole ratio of alcohol to acetaldehyde is about 1.5:1. 5-Ethyl-2-oxazolidinone (mole ratio of acetaldehyde to 2-oxazolidinone is 3:1) is added dropwise to the solution. The mixture is then stirred for 24 hours at 45° C. The mixture is then neutralized to a pH of 6.5-8 with a solution of sodium methoxide. After removing the unconsumed hemiacetal and alcohol under vacuum, the liquid 3-(1-ethoxyethyl)-5-ethyl-2-oxazolidinone is obtained.

Provenance & Evidence