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    PROCESS FOR PRODUCING DIHYDROXY BENZENES
    83.
    发明专利
    PROCESS FOR PRODUCING DIHYDROXY BENZENES 未知

    公开(公告)号：CA1201451A

    公开(公告)日：1986-03-04

    申请号：CA449202

    申请日：1984-03-09

    Applicant: DEGUSSA

    Inventor： DRAUZ KARLHEINZ ,  KLEEMANN AXEL

    IPC: B01J27/00 ,  B01J27/02 ,  C07B61/00 ,  C07C27/00 ,  C07C37/60 ,  C07C39/08 ,  C07C67/00

    Abstract: The nuclear hydroxylation of phenols and phenol derivatives is carried out with solutions of hydrogen peroxide, which are extremely low in water, in solvents forming at the most azeotropes with water whose boiling points are close to or above the boiling point of hydrogen peroxide. The catalyst used is one having the formula XO2, wherein X represents sulphur, selenium or tellurium. Apart from the increase in yield and the fact that technically the nuclear hydxoxylation can be carried out in a much simpler way, the ortho-para ratio and the ortho-ortho ratio of the products are controlled when using selenium dioxide.

    PROCESS FOR PRODUCING PYROCATECHOL AND HYDROQUINONE
    84.
    发明专利
    PROCESS FOR PRODUCING PYROCATECHOL AND HYDROQUINONE 未知

    公开(公告)号：CA1201450A

    公开(公告)日：1986-03-04

    申请号：CA449201

    申请日：1984-03-09

    Applicant: DEGUSSA

    Inventor： DRAUZ KARLHEINZ ,  KLEEMANN AXEL

    IPC: C07C27/00 ,  C07C37/60 ,  C07C39/08 ,  C07C67/00

    Abstract: The known nuclear hydroxylation of phenol with organic solvents of hydrogen peroxide in the presence of a catalyst is carried out with special, practically anhydrous solutions of hydrogen peroxide in solvents forming azeotropes with water, said azeotropes having a boiling point below that of hydrogen peroxide, and also with sulphur dioxide as the catalyst. Therefore, the nuclear hydroxylation can be carried out in a much simpler manner than heretofore. Difficult separations, for example, of water-phenol, or the separation and recovery of the catalyst are dispensed with. Furthermore, the yields are increased.

    PROCESS FOR SELECTIVELY PRODUCING DIHYDROXY BENZENES
    87.
    发明专利
    PROCESS FOR SELECTIVELY PRODUCING DIHYDROXY BENZENES 未知

    公开(公告)号：CA1198126A

    公开(公告)日：1985-12-17

    申请号：CA449199

    申请日：1984-03-09

    Applicant: DEGUSSA

    Inventor： DRAUZ KARLHEINZ ,  KLEEMANN AXEL

    IPC: B01J27/00 ,  C07B61/00 ,  C07C27/00 ,  C07C37/60 ,  C07C39/08 ,  C07C67/00 ,  C07C39/15

    Abstract: The known nuclear hydroxylation of phenol or phenol derivatives with organic hydrogen peroxide solutions in the presence of a catalyst is carried out with hydrogen peroxide solutions which are produced with solvents whose azeotrope boiling points with water lie below the boiling point of hydrogen peroxide. These hydrogen peroxide solutions are extremely low in water. Silenium dioxide is simultaneously used as the catalyst. In addition to the fact that the nuclear hydroxylation can industrially be carried out in a much simpler manner it is possible for the first time to control the ortho to para ratio and two ortho ratios among each other.

    N-CHLORO-CARBONYL-AMINO CARBOXYLIC ESTERS, PROCESS FOR PRODUCING SAME AND ITS USE
    89.
    发明专利
    N-CHLORO-CARBONYL-AMINO CARBOXYLIC ESTERS, PROCESS FOR PRODUCING SAME AND ITS USE 未知

    公开(公告)号：CA1184177A

    公开(公告)日：1985-03-19

    申请号：CA411699

    申请日：1982-09-17

    Applicant: DEGUSSA

    Inventor： DRAUZ KARLHEINZ ,  KLEEMANN AXEL

    IPC: C07D205/04 ,  C07D207/16 ,  C07D211/60 ,  C07D211/62 ,  C07D277/06 ,  C07D279/06 ,  C07D279/12 ,  C07D471/04 ,  C07D487/04 ,  C07D279/00

    Abstract: The present invention provides N-chloro-carbonyl-amino carboxylic esters having the general formula (I) wherein X = -CH2- or -S-, R1 represents a straight-chain or branched alkyl radical containing up to 4 carbon atoms, R2, R3 and R4, each independently represents hydrogen or a methyl radical, R5 represents hydrogen, an alkyl radical, which is either unsubstituted or substituted by substituents stable against phosgene, or all aromatic or heteroaromatic radical, which is either unsubstituted or substituted by substituents stable against phosgene, or R4 and R5 together represent an alkylene radical containing 4 to 5 carbon atoms and 1, m and n, independently of each other, each represents 0, 1 or 2 with the stipulation that the sum of 1, m and n is minimally 1 and maximally 3 and for the case that 1 = 2, R2 and R3 can only represent hydrogen which are useful for producing of active substances of the hydantoin type or of the urea type, particularly for plant protective agents. They are produced by introducing the chloro carbonyl group with phosgene into the corresponding amino carboxylic ester.

    PROCESS FOR PRODUCING L-PROLINE
    90.
    发明专利
    PROCESS FOR PRODUCING L-PROLINE 未知

    公开(公告)号：CA1176263A

    公开(公告)日：1984-10-16

    申请号：CA411710

    申请日：1982-09-17

    Applicant: DEGUSSA

    Inventor： DRAUZ KARLHEINZ ,  KLEEMANN AXEL ,  MARTENS JUERGEN ,  SCHERBERICH PAUL ,  EFFENBERGER FRANZ

    IPC: C07D207/16 ,  C07D207/22

    Abstract: L-proline is produced from the methyl or ethyl ester of the L-pyroglutamic acid which is reacted with at least twice the molar amount of phosgene to form the corresponding 1-chloro-carbonyl-5,5-dichloro-proline ester, the corresponding 2-chloro-1-chloro-carbonyl-pyroline-(2)-carboxylic ester is produced therefrom by splitting off hydrogen chloride and the latter ester is catalytically hydrogenated to the corresponding N-chloro-carbonyl-proline ester which is then acidically hydrolized to L-proline. The L-proline is obtained in large yields.

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