4.
    发明专利
    未知

    公开(公告)号:ID23897A

    公开(公告)日:2000-05-25

    申请号:ID20000612

    申请日:1998-09-25

    Applicant: BASF AG

    Abstract: The invention relates to a method for purifying 2,2,6,6-tetrasubstituted 4-amino-piperidines produced from the corresponding piperidin-4-ones, and subsequent distillation. According to the invention, the distilled 2,2,6,6-tetrasubstituted 4-amino-piperidine is reacted with hydrogen in the presence of a hydrating or dehydrating catalyst and the 4-amino piperidine is then separated from the reaction mixture.

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