Method for Preservation of Alpha, Alpha-Difluoroacetaldehyde Alkyl Hemiacetal

A method for preserving an α,α-difluoroacetaldehyde alkyl hemiacetal, comprising the following steps:

• [First Step] feeding an α,α-difluoroacetaldehyde alkyl hemiacetal of the general formula [3] into a container, thereby forming a gas-liquid state having a gas phase and a liquid phase of the α,α-difluoroacetaldehyde alkyl hemiacetal in the container
• where R1 represents an alkyl group or a substituted alkyl group;
• [Second Step] after the first step, controlling the oxygen concentration of the gas phase in the container to be 5000 ppm or lower by charging oxygen or inert gas into the container;
• and
• [Third Step] after the second step, closing the container and then storing the α,α-difluoroacetaldehyde alkyl hemiacetal in the container under light-shielding conditions.