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    CHROMANYL ESTERS USEFUL FOR THE PREPARATION OF TOCOPHENOL
    75.
    发明专利
    CHROMANYL ESTERS USEFUL FOR THE PREPARATION OF TOCOPHENOL 未知

    公开(公告)号：CA1334852C

    公开(公告)日：1995-03-21

    申请号：CA587810

    申请日：1989-01-09

    Applicant: BASF AG

    Inventor： GEHRKEN HENNING-PETER ,  ERNST HANSGEORG ,  PAUST JOACHIM

    IPC: C07D311/58

    Abstract: Disclosed are new chromanyl ester of (a) the formula (IV) (IV) (b) the formula (IV') (IV') and (c) the formula (I''') (I''') either as a mixture of two diastereomers or as a pure diastereomer thereof, wherein the group is optically active residue, R1, R2, R3 and R4 are, independently, each hydrogen or C1-C4-alkyl, R' is C1-C4-alkyl, R5 is C1-C4 alkyl and Ar is phenyl or naphthyl unsubstituted or substituted by more than two substituents selected amongst C1-C4-alkyl, C1-C4-alkoxy, chlorine, bromine, cyano and nitro. These compounds are intermediates for use in preparing tocopherol.

    76.
    发明专利
    未知

    公开(公告)号：NO932860L

    公开(公告)日：1994-02-14

    申请号：NO932860

    申请日：1993-08-11

    Applicant: BASF AG

    Inventor： KAISER KLAUS ,  BALKENHOHL FRIEDHELM ,  PAUST JOACHIM

    IPC: C07F9/655 ,  C07F9/572

    Abstract: Process for obtaining the calcium salt of ascorbyl 2-monophosphate from aqueous/alkaline reaction mixtures as they are obtained when ascorbic acid is reacted with a molar excess of phosphorus oxychloride in the presence of a tertiary amine while maintaining a pH of 12 to 13 during the reaction by means of an aqueous alkali metal solution, which process is characterised in that a) starting from a reaction mixture which has been obtained by reacting ascorbic acid with phosphorus oxychloride in the presence of pyridine while maintaining a pH of 12 to 13 by means of an aqueous potassium hydroxide solution, b) the phosphoric acid ions formed during this reaction are precipitated by means of magnesium chloride in amounts of approximately 1 mol per mol of phosphoric acid ions as potassium magnesium phosphate, c) the potassium magnesium phosphate is separated off, d) the pyridine together with some of the water is removed from the remaining aqueous solution by distillation, e) the resulting aqueous solution is reacted with calcium chloride and f) the calcium salt of ascorbyl 2-monophosphate, which crystallises out during this process in the form of the calcium salt, is isolated, or in that, after process step a), the pyridine/water mixture is first removed as described in process step d) and process steps (b), (c), (e) and (f) are subsequently carried out.

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