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    Process for the preparation of tetrachloro-1,4-benzoquinone
    1.
    发明专利
    Process for the preparation of tetrachloro-1,4-benzoquinone 未知

    公开(公告)号：DE4336323C1

    公开(公告)日：1995-03-09

    申请号：DE4336323

    申请日：1993-10-25

    Applicant: HOECHST AG

    Inventor： ARNDT OTTO DR ,  SCHUBERT HANS DR

    IPC: B01J27/128 ,  C07B61/00 ,  C07C46/00 ,  C07C46/06 ,  C07C46/10 ,  C07C50/24 ,  C10M131/10

    Abstract: Process for the preparation of tetrachloro-1,4-benzoquinone in high purity by allowing chlorine and concentrated hydrochloric acid to act on hydroquinone, in which process some of the hydroquinone to be employed is introduced into an amount of 20 to 37% strength aqueous hydrochloric acid whose molarity is 4 to 6 times the total amount of hydroquinone and which contains catalytic amounts of iron(III) ions and an anionic dispersant, chlorine gas whose molarity is 1.5 to 2.0 times the amount of total hydroquinone is passed into this solution at a temperature of 20 to 90 DEG C, the remaining hydroquinone is subsequently added in the form of a solid or in dissolved form, chlorine gas whose molarity is 1.5 to 2.0 is passed in, the concentration of the hydrochloric acid is maintained at 23-25% by adding water, and, finally, the temperature is raised to 100 to 107 DEG C while passing in more chlorine gas (molarity 1.7 to 2.5) and diluting with water down to a hydrochloric acid concentration of 20 to 22%.

    2.
    发明专利
    未知

    公开(公告)号：DE3120912A1

    公开(公告)日：1982-12-16

    申请号：DE3120912

    申请日：1981-05-26

    Applicant: HOECHST AG

    Inventor： SCHUBERT HANS DR ,  BAESSLER KONRAD DR

    IPC: C07B61/00 ,  B01J31/00 ,  C07C205/37 ,  C07C79/35 ,  C07C76/02

    Abstract: The invention provides a process for the preparation of p-nitrophenetole with high yields and in an especially pure form from p-chloronitrobenzene and ethanol by heating to a temperature of from 60 DEG to 80 DEG C. with addition of alkali metal hydroxide and a phase transfer catalyst.

    3.
    发明专利
    未知

    公开(公告)号：DE19702282C2

    公开(公告)日：1998-11-19

    申请号：DE19702282

    申请日：1997-01-23

    Applicant: HOECHST AG

    Inventor： PASENOK SERGEJ DR ,  APPEL WOLFGANG DR ,  PFIRMANN RALF DR ,  WESSEL THOMAS DR ,  SCHACH THOMAS DR ,  SCHUBERT HANS DR

    IPC: B01J31/02 ,  C07B39/00 ,  C07B61/00 ,  C07C17/20 ,  C07C25/02 ,  C07C45/63 ,  C07C47/55 ,  C07C201/12 ,  C07C205/12 ,  C07C205/07 ,  C07C25/13 ,  C07D227/06 ,  C07D247/00 ,  C07D255/02

    Abstract: PCT No. PCT/EP90/00332 Sec. 371 Date Jul. 21, 1999 Sec. 102(e) Date Jul. 21, 1999 PCT Filed Jan. 22, 1998 PCT Pub. No. WO98/32532 PCT Pub. Date Jul. 30, 1998Catalyst for halogen-fluorine exchange reactions on aromatics, consisting essentially of a mixture of one or more compounds of the component a) plus at least one compound of the components b), c) and/or d), wherein a) is an amidophosphonium salt of the formula (I) where A1, A2, A3, A4, A5, A6, A7, A8 are, independently of one another, identical or different and are each a straight-chain or branched alkyl or alkenyl having from 1 to 12 carbon atoms, cycloalkyl having from 4 to 8 carbon atoms, an aryl having from 6 to 12 carbon atoms, an aralkyl having from 7 to 12 carbon atoms, or A1 A2, A3A4, A5A6, A7A8 are, independently of one another, identical or different and are in each case connected to one another either directly or via O or N-A9 to form a ring having from 3 to 7 ring atoms, A9 is an alkyl having from 1 to 4 carbon atoms and B(-) is a monovalent acid anion or the equivalent of a polyvalent acid anion, b) a quaternary ammonium salt, c) a quaternary phosphonium salt, and d) a crown ether or a polyether of the formula (IV): R10 -(O-OxH2x)r-OR11 (IV).

    4.
    发明专利
    未知

    公开(公告)号：DE19702282A1

    公开(公告)日：1998-07-30

    申请号：DE19702282

    申请日：1997-01-23

    Applicant: HOECHST AG

    Inventor： PASENOK SERGEJ DR ,  APPEL WOLFGANG DR ,  PFIRMANN RALF DR ,  WESSEL THOMAS DR ,  SCHACH THOMAS DR ,  SCHUBERT HANS DR

    IPC: B01J31/02 ,  C07B39/00 ,  C07B61/00 ,  C07C17/20 ,  C07C25/02 ,  C07C45/63 ,  C07C47/55 ,  C07C201/12 ,  C07C205/12 ,  C07C205/07 ,  C07C25/13 ,  C07D227/06 ,  C07D247/00 ,  C07D255/02

    Abstract: A catalyst for halogen-fluorine exchange reactions of aromatic compounds essentially consists of a mixture of one or more compounds (a) and at least one compound (b), (c) and/or (d). (a) is an amidophosphonium salt of formula (I), in which A , A , A , A , A , A , A and A are the same or different and independently represent a straight- or branched-chain alkyl or alkenyl with 1 to 12 carbon atoms, cycloalkyl with 4 to 8 carbon atoms, aryl with 6 to 12 carbon atoms, aralkyl with 7 to 12 carbon atoms, or A A , A A , A A , A A are independent, the same or different and are joined together directly or via O or N-A into a ring with 3 to 7 members; A stands for an alkyl with 1 to 4 carbon atoms and B represents a monovalent acid radical or the equivalent of a polyvalent acid radical; (b) is a quaternary ammonium salt; (c) is a quaternary phosphonium salt; (d) is a crown ether or polyether of formula (IV) R -(O-CxH2x)r-OR , in which R and R are the same or different and represent a linear or branched alkyl radical with 1 to 16, preferably 1 to 8, carbon atoms; x is an integer from 2 to 6, preferably 2 to 3; and r is an integer from 0 to 20, preferably 1 to 18, in particular 4 to 14.

    9.
    发明专利
    未知

    公开(公告)号：DE3922036A1

    公开(公告)日：1991-01-31

    申请号：DE3922036

    申请日：1989-07-05

    Applicant: HOECHST AG

    Inventor： PAPENFUHS THEODOR DR ,  HESS REINER DR ,  SCHUBERT HANS DR

    IPC: C07C209/10

    Abstract: Process for preparing 4,5-dichloro-2-nitroaniline in which 2,4,5-trichloronitrobenzene is reacted with approximately 200 to 3000 mol per cent of ammonia in a solvent inert to ammonia, at temperatures of approximately 150 to 220 DEG C.

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