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公开(公告)号：CA2114504A1
公开(公告)日：1994-07-30
申请号：CA2114504
申请日：1994-01-28
Applicant: HOECHST AG
Inventor： PFIRMANN RALF , PAPENFUHS THEODOR , WEICHSELBAUMER GEORG
IPC: C07B61/00 , C07C45/63 , C07C47/55 , C07C51/363 , C07C63/70 , C07C67/307 , C07C69/78 , C07C231/12 , C07C233/65 , C07C253/30 , C07C255/50 , C07C69/76
Abstract: of the disclosure The present invention relates to a process for the preparation of compounds of the formula (I), in which R1 is -CN, -COOH, -COOR', R' being an organic radical having 1 to 6 carbon atoms, -CONH2, -COCl or -CHO and R2 is H or Cl, which comprises reacting a compound of the formula (II), in which R1 is as defined above and R3 is H or Cl, with a chlorinating agent in the presence of a chlorination catalyst at -10 to 200.degree.C.
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公开(公告)号：IN173259B
公开(公告)日：1994-03-19
申请号：IN227CA1992
申请日：1992-04-06
Applicant: HOECHST AG
Inventor： PAPENFUHS THEODOR , PFIRMANN RALF
IPC: C07C63/08
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公开(公告)号：CA2089938A1
公开(公告)日：1993-08-21
申请号：CA2089938
申请日：1993-02-19
Applicant: HOECHST AG
Inventor： PFIRMANN RALF , PAPENFUHS THEODOR
IPC: B01J31/24 , C07B61/00 , C07D213/61 , C07D213/84
Abstract: Process for the preparation of substituted 2,3-difluoro-pyridines The invention relates to a novel process for the preparation of substituted 2,3-difluoropyridines by reaction of substituted 2,3-halopyridines with fluoride salts in the presence of phase transfer catalysts, preferably in polar aprotic solvents, without removing the resulting substituted 2,3-difluoropyridines continuously from the reaction mixture. The substituted 2,3-difluoropyridines which can be prepared according to the invention are, inter alia, starting materials for the preparation of plant protection agents or pharmaceuticals.
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公开(公告)号：MX9605991A
公开(公告)日：1998-04-30
申请号：MX9605991
申请日：1996-11-29
Applicant: HOECHST AG
Inventor： PFIRMANN RALF , SEITZ FRIEDRICH
IPC: B01F7/00 , B01F15/00 , B01J19/00 , B01J19/02 , B01J19/18 , C07B39/00 , C07B61/00 , C07C45/46 , C07C51/06 , C07C51/08 , C07C51/38 , C07C63/70 , C07C201/12 , C07C205/22 , C07C205/26 , C07C63/10 , C07C205/00
Abstract: Procedimiento para la preparacion de compuestos fluorados por reduccion en un recipiente provisto de un agitador, estando constituido el agitador total o parcialmente por un material de carbono.
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公开(公告)号：IN179541B
公开(公告)日：1997-10-18
申请号：IN657CA1992
申请日：1992-09-14
Applicant: HOECHST AG
Inventor： PAPENFUHS THEODOR , FOLZ GEORG , PFIRMANN RALF
IPC: C07C25/13
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Patent Agency Ranking
公开(公告)号：CA2092407C
公开(公告)日：1997-03-18
申请号：CA2092407
申请日：1991-09-25
Applicant: HOECHST AG
Inventor： PAPENFUHS THEODOR , HACKENBRUCH JOACHIM , PFIRMANN RALF
IPC: B01J23/02 , C07B61/00 , C07C201/12 , C07C205/26
Abstract: According to a process for producing isomer-free 2,3-difluor-6-nitrophenol, 2,3,4-trifluornitrobenzol is reacted with an aqueous solution of alkali metal or alkaline earth metal hydroxide in the absence of organic solvent, at temperatures between about 20.degree.C and 100.degree.C, the pH value of the reaction mixture is set at about 1 to 6 by acid addition, the resulting product is steam distilled and the 2,3-difluor-6-nitrophenol is isolated after cooling. No organic solvents are used during any of the steps of the process.
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47.发明专利
公开(公告)号：ZA967367B
公开(公告)日：1997-02-28
申请号：ZA967367
申请日：1996-08-30
Applicant: HOECHST AG
Inventor： PAPENFUHS THEODOR , PFIRMANN RALF , KRAUSE STEFAN , NEUMANN-GRIMM DORIS
IPC: C07C227/18 , C07C229/58 , C07C
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48.发明专利
公开(公告)号：ZA9607367B
公开(公告)日：1997-02-28
申请号：ZA9607367
申请日：1996-08-30
Applicant: HOECHST AG
Inventor： PAPENFUHS THEODOR , PFIRMANN RALF , KRAUSE STEFAN , NEUMANN-GRIMM DORIS
IPC: C07C227/18 , C07C229/58 , C07C
CPC classification number: C07C227/18
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公开(公告)号：IN176049B
公开(公告)日：1995-12-30
申请号：IN40CA1993
申请日：1993-01-25
Applicant: HOECHST AG
Inventor： PFIRMANN RALF , PAPENFUHS THEODOR
IPC: C07D213/61
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公开(公告)号：IN174420B
公开(公告)日：1994-12-03
申请号：IN646CA1992
申请日：1992-09-07
Applicant: HOECHST AG
Inventor： PFIRMANN RALF , PAPENFUHS THEODOR , FORSTINGER KLAUS
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