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    2.
    发明专利
    未知

    公开(公告)号：DE2910131A1

    公开(公告)日：1980-09-25

    申请号：DE2910131

    申请日：1979-03-15

    Applicant: BASF AG

    Inventor： ROSS KARL-HEINZ DIPL CHEM DR ,  DUDECK CHRISTIAN DIPL CHEM DR ,  HIMMELE WALTER DIPL CHEM DR ,  LEBKUECHER ROLF DIPL CHEM DR ,  SAUER WOLFGANG DIPL CHEM DR

    IPC: C07D303/14 ,  C07D307/20 ,  C07D307/32 ,  C07D307/60 ,  A61K7/46 ,  A23L2/26 ,  A23L1/235

    Abstract: A process for the preparation of the sought-after scent 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one, and novel intermediates for the preparation of this compound. 2,5-Dimethyl-4-hydroxy-2,3-dihydrofuran-3-one is prepared by first epoxidizing hex-3-ene-2,5-diol in the liquid phase with hydrogen peroxide to give the novel compound 3,4-epoxy-hexane-2,5-diol, which at 40 DEG -280 DEG C. is converted, by means of a catalytic amount of an acid, to the novel compound 2,5-dimethyl-3,4-dihydroxy-tetrahydro-furan. The latter is dehydrogenated by means of oxygen over a silver catalyst or copper catalyst to give the nove compound 2,5-dimethyl-4-hydroxy-tetrahydrofuran-3-one, which is oxidized by means of bismuth oxide, in concentrated acetic acid solution, to give the desired compound 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one.

    Prepn. of aliphatic hydroxy-carbonyl derivs. - by catalytic oxidation of hydroxy alcohol(s), using layered silver catalyst opt. contg. copper
    3.
    发明专利
    Prepn. of aliphatic hydroxy-carbonyl derivs. - by catalytic oxidation of hydroxy alcohol(s), using layered silver catalyst opt. contg. copper 未知

    公开(公告)号：DE2815752A1

    公开(公告)日：1979-10-25

    申请号：DE2815752

    申请日：1978-04-12

    Applicant: BASF AG

    Inventor： DUDECK CHRISTIAN DIPL CHEM DR ,  LEHMANN GUNTER ING GRAD ,  PETRI NORBERT DIPL CHEM DR ,  DIEM HANS DIPL CHEM DR ,  FLIEGE WERNER DIPL CHEM DR ,  MEISSNER BERND DIPL CHEM DR ,  ROSS KARL-HEINZ DIPL CHEM DR ,  MUEHLTHALER WOLFGANG ING GRAD

    IPC: B01J23/50 ,  B01J23/72 ,  B01J27/14 ,  B01J35/02 ,  B01J37/02 ,  C07C49/175 ,  C07C45/16

    Abstract: The prepn. of aliphatic hydroxy carbonyl cpds. (I), which have been etherified with aliphatic gps., by catalytic oxidation of the corresp. etherified hydroxyalcohols (II) in the presence of metal catalysts comprises oxidising (II) at 450-700 degrees C in the presence of a catalyst with total layer thickness 5-100 mm. The catalyst comprises (a) 3 or more layers of silver crystals, in which one part of the silver crystal layer contains 30-85 wt.% of the catalyst with particles of size 1-2.5 mm., one part contains 2-30 wt.% of the catalyst with particle size 0.75-1 mm., and the rest of the silver crystal layers contain 8-50 wt.% of the catalyst with particle size 0.2-0.75 mm., together with one or more layers of copper crystals, contg. 1-40 wt.% of the catalyst with particle size 0.2-0.75 mm.; or (b) silver crystal layers as above, together with one or more layers of copper crystals contg. 0.5-40 wt.% of the catalyst with particle size 0.2-75 mm. and one or more layers of catalyst particles with 70-99 wt.% Cu, 0.9-20 wt.% tin and 0.1-10 wt.% P, (based on the wt. of the particles of these elements) so that the layers of catalyst particles contain 0.5-10 wt.% catalyst with particle size 0.2-0.75 mm. or (c) only silver crystal layers as in (a), except that the part of the layers with particle size 0.2-0.75 mm. contain 13.68 wt.% of the catalyst. (I) are starting materials in the prepn. of dyestuffs, pesticides, plastics and perfumes. (I) are obtd. in better yield, space-time yield and purity than in previous processes, and the life of the catalyst is longer (30 days, in the case of methoxyacetaldehyde).

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