53.
    发明专利
    未知

    公开(公告)号:FI73977B

    公开(公告)日:1987-08-31

    申请号:FI830037

    申请日:1983-01-06

    Applicant: DEGUSSA

    Abstract: The subject matter of the invention is a process for the recovery of S-(carboxymethyl)-(R)-cysteine and S-(carboxymethyl)-(S)-cysteine from a mixture of the two enantiomers. The mixture to be separated is dissolved in water in the presence of sufficient ammonia that the ammonium salt solution formed has a pH between 6 and 9. Then there is brought about in the solution of ammonium salt a state of supersaturation by the addition of seeding crystals of the ammonium salt of one of the two enantiomers, insofar as the starting material contains one of the two enantiomers in excess, the ammonium salt of this enantiomer, the ammonium salt of one of the two enantiomers is brought to crystallization and separated off. Subsequently by addition of seeding crystals of the ammonium salt of the other enantiomers to the remaining mother liquor the ammonium salt of this enantiomer is likewise brought to crystallization and separated off. Finally the respective S-(carboxymethyl)-cysteine is set free from the two ammonium salts.

    PROCESS FOR PRODUCING NON-AQUEOUS HYDROGEN PEROXIDE SOLUTIONS

    公开(公告)号:CA1206741A

    公开(公告)日:1986-07-02

    申请号:CA449245

    申请日:1984-03-09

    Applicant: DEGUSSA

    Abstract: The production of hydrogen peroxide solutions extremely low in water in higher boiling solvents by mixing hydrogen peroxide solutions in solvents whose azeotrope boiling points with water lie below the boiling point of hydrogen peroxide with higher boiling solvents which at best form azeotropes with water whose boiling points lie close to or above the boiling point of hydrggen peroxide. The mixture is then freed from water and from the lower boiling solvents by distillation. An in situ method for producing the above mixture is described.

    PROCESS FOR N-SUBSTITUTED AMIDES OF ALPHA-KETO-CARBOXYLIC ACIDS

    公开(公告)号:HU179151B

    公开(公告)日:1982-08-28

    申请号:HUDE000969

    申请日:1978-07-21

    Applicant: DEGUSSA

    Abstract: Compounds are prepared of the formula (I) where R' is a t-alkyl group having 4 to 18 carbon atoms, preferably t-butyl, t-amyl or t-octyl and R is a straight or branched chain alkyl group with 1 to 18 carbon atoms, preferably 1 to 10 carbon atoms or an alkyl group substituted with one or more phenyl group or a halogen atom, particularly a chlorine atom, or a cycloalkyl group with 3 to 8 carbon atoms, particularly cyclopropyl, which can be substituted by one or more 1 to 3 carbon atom alkyl groups or one or more halogen atoms, preferably chlorine, or phenyl or naphthyl or a five membered heterocyclic group or such phenyl, naphthyl or heterocyclic group substituted by halogen atoms, nitro groups, alkyl or alkoxy with 1 to 5 carbon atoms by condensing in acid medium an acyl cyanide of the formula R-CO-CN (II) where R is as defined above with either (a) a tertiary alcohol of the formula HO-R'(III) in which R' is as defined above, or preferably (b) an alkene of the formula (IV) where R1 and R2 are the same or different and are hydrogen or an alkyl group and wherein R3 and R4 are the same or different and wherein the alkyl groups in each case can be 1 to 15 carbon atoms. Some of the compounds are new. They are useful as intermediates for synthesizing herbicides and can be used directly as fungicides.

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