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    METHOD FOR THE SINGLE STEP PREPARATION OF GLYCOSYL FLUORIDES
    2.
    发明专利
    METHOD FOR THE SINGLE STEP PREPARATION OF GLYCOSYL FLUORIDES 未知

    公开(公告)号：DE3574144D1

    公开(公告)日：1989-12-14

    申请号：DE3574144

    申请日：1985-08-27

    Applicant: HOECHST AG

    Inventor： FRANZ RAIMUND DR ,  DEGER HANS-MATTHIAS DR ,  SCHLINGMANN MERTEN DR

    IPC: C07H1/00 ,  C07H5/02 ,  C07H13/04

    Abstract: A process for the single-stage preparation of glycosyl fluorides by dissolving saccharides in liquid hydrogen fluoride and evaporating the hydrogen fluoride, wherein the resulting glycosyl fluoride is isolated in such a way that, when the evaporation of the hydrogen fluoride is started at a relatively high temperature, in general at -20 DEG to +20 DEG C., the evaporation is effected at a high evaporation rate or, when a low evaporation rate is used at the start of the evaporation, a sufficiently low temperature is set, in general -80 DEG C. to -30 DEG C.

    5.
    发明专利
    未知

    公开(公告)号：DE3432565A1

    公开(公告)日：1986-03-13

    申请号：DE3432565

    申请日：1984-09-05

    Applicant: HOECHST AG

    Inventor： FRANZ RAIMUND DR ,  DEGER HANS-MATHIAS DR ,  SCHLINGMANN MERTEN DR

    IPC: C07H1/00 ,  C07H5/02 ,  C07H13/04

    Abstract: A process for the single-stage preparation of glycosyl fluorides by dissolving saccharides in liquid hydrogen fluoride and evaporating the hydrogen fluoride, wherein the resulting glycosyl fluoride is isolated in such a way that, when the evaporation of the hydrogen fluoride is started at a relatively high temperature, in general at -20 DEG to +20 DEG C., the evaporation is effected at a high evaporation rate or, when a low evaporation rate is used at the start of the evaporation, a sufficiently low temperature is set, in general -80 DEG C. to -30 DEG C.

    Prepn. of (2,3,3,3)-tetrafluoro-propionic acid - from hexafluoro-propene and water
    7.
    发明专利
    Prepn. of (2,3,3,3)-tetrafluoro-propionic acid - from hexafluoro-propene and water 未知

    公开(公告)号：DE2555898A1

    公开(公告)日：1977-06-23

    申请号：DE2555898

    申请日：1975-12-12

    Applicant: HOECHST AG

    Inventor： MARTINI THOMAS DR ,  FRANZ RAIMUND DR

    IPC: C07C51/00 ,  C07C53/34 ,  C07C31/34

    Abstract: Prepn. of 2,3,3,3-tetrafluoropropionic acid (I) comprises reacting hexafluoropropene (II) with H2O at 30-200 degrees C in the presence of a tert. amine. The resulting salt is then converted to the free acid. The reaction is pref. effected using a 2-to 5-fold excess of H2O in a polar aprotic solvent. The tert. amine (esp. NEt3 or pyridine) is pref. used in an amt. of >=0.1 mole per mole of (II). The salt is isolated by distilling off volatile components and is converted into the free acid by adding a nonvolatile strong acid (esp. H2SO4). The free acid is then distd. off. (I) is useful as a solvent, an intermediate for polymerisable perfluoroacrylic cpds., and an intermediate for inhalation narcotics. The use of (I) for the prepn. of 2,3,3,3-tetrafluoropropanol is claimed. The process is simpler than those described in US 2795601 and 2862024.

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