METHOD FOR PRESERVATION OF , -DIFLUOROACETALDEHYDE ALKYL HEMIACETAL

    公开(公告)号:EP3290400A4

    公开(公告)日:2018-08-01

    申请号:EP17762037

    申请日:2017-03-23

    IPC分类号: C07C41/58 C07C43/317

    CPC分类号: C07C41/58 C07C43/317

    摘要: Disclosed is a method for preserving an ±,±-difluoroacetaldehyde alkyl hemiacetal of the following formula in a gas-liquid state having gas and liquid phases in a closed container under an atmosphere of oxygen (O 2 ) or inert gas, characterized by: controlling the oxygen concentration of the gas phase in the container to be 5000 ppm or lower; and then storing the ±,±-difluoroacetaldehyde alkyl hemiacetal in the container under light-shielding conditions where R 1 represents an alkyl group or a substituted alkyl group. It is possible by this method to suppress conversion of the ±,±-difluoroacetaldehyde alkyl hemiacetal to difluoroacetic acid over a long term.