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    PREPARATION OF N-ARYLOXAZOLIDINE-2,4-DIONES
    1.
    发明专利
    PREPARATION OF N-ARYLOXAZOLIDINE-2,4-DIONES 未知

    公开(公告)号：CA1133910A

    公开(公告)日：1982-10-19

    申请号：CA347096

    申请日：1980-03-06

    Applicant: BASF AG

    Inventor： MERGER FRANZ ,  TOWAE FRIEDRICH

    IPC: B01J23/00 ,  C07B61/00 ,  C07D263/44 ,  C07D263/52

    Abstract: O.Z. 0050/033,771 N-Aryloxazolidine-2,4-diones are prepared by reacting a nitrobenzene with a 2hydroxycarboxylic acid ester and carbon monoxide in the presence of selenium and a basic compound under superatmospheric pressure and at an elevated temperature. The N-aryloxazolidine-2,4-diones of the formula I, obtainable by the process of the invention are valuable active ingredients and starting materials for the preparation of crop protection agents, dyes and drugs.

    MULTIPLE-STEP PROCESS FOR THE PREPARATION OF HEXAMETHYLENE DIISOCYANATE-1,6 AND/OR ISOMERIC ALIPHATIC DIISOCYANATES WITH SIX CARBON ATOMS IN THE ALKYLENE RESIDUE
    2.
    发明专利
    MULTIPLE-STEP PROCESS FOR THE PREPARATION OF HEXAMETHYLENE DIISOCYANATE-1,6 AND/OR ISOMERIC ALIPHATIC DIISOCYANATES WITH SIX CARBON ATOMS IN THE ALKYLENE RESIDUE 未知

    公开(公告)号：CA1225999A

    公开(公告)日：1987-08-25

    申请号：CA452343

    申请日：1984-04-18

    Applicant: BASF AG

    Inventor： MERGER FRANZ ,  TOWAE FRIEDRICH ,  HELLBACH HANS ,  ISBARN GUNTHER ,  KOEHLER WALDEMAR

    IPC: C07C265/14 ,  C07C67/00 ,  C07C69/00 ,  C07C241/00 ,  C07C263/04 ,  C07C263/06 ,  C07C265/04 ,  C07C119/042

    Abstract: MULTIPLE-STEP PROCESS FOR THE PREPARATION OF HEXAMETHYLENE DIISOCYANATE-1,6 AND/OR ISOMERIC ALIPHATIC DIISOCYANATES WITH SIX CARBON ATOMS IN THE ALKYLENE RESIDUE Hexamethylene diisocyanate and/or isomeric alkylene diisocyanates having 6 carbon atoms in the alkylene radical, preferably 2-methylpentamethylene 1,5-diiqocyanate and/or 2-ethyltetramethylene 1,4-diisocyanate are prepared without the use of phosgene in a multiple-step process by means of a) reacting hexamethylene 1,6-diamine and/or isomeric alkylene diamines having 6 carbon atoms in the alkylene radical with urea and alcohol in the presence of dialkyl carbonate and/or carbamic acid alkyl ester as well as, in some cases, catalysts to form hexamethylene 1,6-dialkylurethane and/or isomeric alkylene dialkylurethanes having 6 carbon atoms in the alkylene radical, b) separation and return to reaction step (a) of alcohol, dialkyl carbonate, and/or carbamic acid alkyl ester from the reaction mixture c) evaporation of the hexamethylene 1,6-dialkylurethane and/or isomeric alkylene dialkylurethanes having 6 carbon atoms in the alkylene radical, d) cleavage of the vaporized diurethanes into hexa methylene diisocyanate and/or isomeric alkylene diisocyanate having 6 carbon atoms in the alkylene radical and alcohol, and e) fractional condensation of the cleavage products.

    PROCESS FOR THE PREPARATION OF N,O-SUBSTITUTED MONO- AND/OR POLYURETHANES
    3.
    发明专利
    PROCESS FOR THE PREPARATION OF N,O-SUBSTITUTED MONO- AND/OR POLYURETHANES 未知

    公开(公告)号：CA1249596A

    公开(公告)日：1989-01-31

    申请号：CA459700

    申请日：1984-07-25

    Applicant: BASF AG

    Inventor： MERGER FRANZ ,  TOWAE FRIEDRICH

    IPC: C08G71/00 ,  C07C67/00 ,  C07C239/00 ,  C07C269/00 ,  C08G71/04 ,  C07C125/06

    Abstract: PROCESS FOR THE PREPARATION OF N,o-SUBSTITUTED MONO- AND/OR POLYURETHANES The invention describes a process for the preparation of N,o-substituted mono- and/or polyurethanes of formula R1¢-NHCOOR2!n, in which R1 is an aliphatic, cycloaliphatic, aromatic, araliphatic, or heterocyclic radical, which may be substituted, R2 is an aliphatic, cycloaliphatic, or araliphatic radical which may be substituted with alkoxy or polyoxyalkylene groups, and n is a whole number from 1 to 5, through the reaction of N-substituted allophanates and/or polyallophanates with alcohols R2OH in the presence or absence of catalysts at temperatures of at least 160.degree.C, preferably from 165.degree. to 250.degree.C.

    PREPARATION OF HEXAMETHYLENE 1,6-DIISOCYANATE AND/OR ISOMERIC DIISOCYANATES WHERE ALKYLENE IS OF 6 CARBON ATOMS
    8.
    发明专利
    PREPARATION OF HEXAMETHYLENE 1,6-DIISOCYANATE AND/OR ISOMERIC DIISOCYANATES WHERE ALKYLENE IS OF 6 CARBON ATOMS 未知

    公开(公告)号：CA1225998A

    公开(公告)日：1987-08-25

    申请号：CA432977

    申请日：1983-07-22

    Applicant: BASF AG

    Inventor： MERGER FRANZ ,  NESTLER GERHARD ,  TOWAE FRIEDRICH ,  HELLBACH HANS

    IPC: C07C263/04 ,  C07C265/04 ,  C08G18/73 ,  C07C119/042

    Abstract: Hexamethylene 1,6-diiso-cyanate and/or isomeric aliphatic diisocyanates where alkylene is of 6 carbon atoms, preferably 2-methylpenta-methylene 1,5-diisocyanate and/or 2-ethyltetramethylene 1,4-diisocyanate, are prepared by a process wherein the corresponding dialkylurethanes are vaporized, without decomposition, at from 220 to 300.degree.C, advantageously under reduced pressure, the dialkylurethane vapors are subjected to thermal cleavage under reduced pressure, preferably from 0.1 to 200 mbar, and at above 300.degree.C, preferably from 310 to 480.degree.C, in particular in the presence of a hydrogen halide and/or a donor which forms hydrogen halide under the reaction conditions, so that the hydrogen halide concentration during cleavage is from 0.001 to 1.0 mole %, based on the dialkylurethanes, and the cleavage products are fractionally condensed. The product obtained in the 1st condensation stage consists predominantly of the diisocyanates, while that obtained in the 2nd condensation stage is the alcohol.

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