34.
    发明专利
    未知

    公开(公告)号:DE1643249A1

    公开(公告)日:1971-06-03

    申请号:DE1643249

    申请日:1967-10-06

    Applicant: BASF AG

    Inventor: MERKEL KARL DR

    N-mono-and n,n'-bis-hydroxy alkyl piperaines - prodn using inert polar solvents

    公开(公告)号:DE1954546A1

    公开(公告)日:1971-05-06

    申请号:DE1954546

    申请日:1969-10-30

    Applicant: BASF AG

    Abstract: High yields of pure N-mono- and N,N'-bis-hydroxyalkylpiperazines for use as pharmaceutical intermediates are obtained by reacting piperazine with alkylene oxides, esp ethylene oxide in inert polar solvents, b.p. 130-170 degrees at ordinary pressure (an alcohol, an ether or ether alcohol e.g. ethylene-glycol-mono-n-propylether, or an ester e.g. isoamylacetate), and dissolving at least 5 w/% piperazine at 50 degrees. Slightly raised pressures and temp. of 80-120 degrees are favoured. No catalysts are required.

Patent Agency Ranking