公开(公告)号：DE3879113D1

公开(公告)日：1993-04-15

申请号：DE3879113

申请日：1988-11-17

Applicant: HOECHST AG

Inventor： ROEHRSCHEID FREIMUND DR ,  SIEGEMUND GUENTER DR ,  LAU JUERGEN DR

IPC: C07B61/00 ,  B01J31/04 ,  C07C51/265 ,  C07C51/60 ,  C07C65/24 ,  C07D307/89

Abstract: Partially fluorinated carboxylic acids of structure (I), their acid chlorides and anhydrides, are new. In formulae, R = H or -COOH (acid chloride with R = H only, anhydrides with R = -COOH only). Also claimed is a process for the prepn. of cpds. (I) and related cpds. of structure (II); where X = gp. of formulae (IIa) or (IIb); and their acid chlorid=s and anhydrides (defined as for I). The process entails oxidn. of the corresp. methyl cpds. by atmospheric O2 at high pressure in an acidic medium in the presence of a catalyst mixt. comprising heavy metal acetates in admixture with a bromide co-catalyst. The resulting carboxylic acids are elaborated to the corresp. derivs. by improved procedures .

公开(公告)号：DE3134131A1

公开(公告)日：1983-03-17

申请号：DE3134131

申请日：1981-08-28

Applicant: HOECHST AG

Inventor： ROEHRSCHEID FREIMUND DR ,  RIEMENSCHNEIDER WILHELM DR

IPC: C07C63/49 ,  B01J31/00 ,  C07C46/04 ,  C07C51/00 ,  C07C51/31 ,  C07C67/00 ,  C07C63/40

Abstract: The invention relates to a process for the preparation of alkali metal salts of naphthalene-1,4,5,8-tetracarboxylic acid by the oxidation of pyrene. The latter is treated, in a lower alkanecarboxylic acid, with an organic hydroperoxide or a percarboxylic acid in the presence of a metal compound, and the resulting intermediate is reacted with chlorine in aqueous alkaline solution. The free naphthalene-1,4,5,8-tetracarboxylic acid is obtained from the alkali metal salts using mineral acids. Most importantly, the process according to the invention makes it possible to avoid the procedural difficulties and serious environmental concerns which are associated with the disposal of substantial quantities of concentrated sulphuric acid which has hitherto been used as the solvent for the pyrene oxidation.

公开(公告)号：DE3119819A1

公开(公告)日：1982-12-16

申请号：DE3119819

申请日：1981-05-19

Applicant: HOECHST AG

Inventor： ROEHRSCHEID FREIMUND DR ,  RIEMENSCHNEIDER WILHELM DR

IPC: C07B61/00 ,  B01J23/00 ,  B01J23/46 ,  C07C67/00 ,  C07C253/00 ,  C07C255/45 ,  C07C255/47 ,  C07C121/46

公开(公告)号：CH608480A5

公开(公告)日：1979-01-15

申请号：CH1174474

申请日：1974-08-28

Applicant: HOECHST AG

Inventor： ROEHRSCHEID FREIMUND DR

IPC: C07C63/40 ,  B01J23/00 ,  B01J31/00 ,  C07B61/00 ,  C07C51/00 ,  C07C51/31 ,  C07C67/00

公开(公告)号：DE2140644A1

公开(公告)日：1973-02-22

申请号：DE2140644

申请日：1971-08-13

Applicant: HOECHST AG

Inventor： ROEHRSCHEID FREIMUND DR

IPC: C07C51/10 ,  C07C53/34

公开(公告)号：DE1768267A1

公开(公告)日：1971-10-28

申请号：DE1768267

申请日：1968-04-23

Applicant: HOECHST AG

Inventor： ROEHRSCHEID FREIMUND DR

IPC: C07C6/06 ,  C07C3/00

公开(公告)号：DE4441881A1

公开(公告)日：1996-05-30

申请号：DE4441881

申请日：1994-11-24

Applicant: HOECHST AG

Inventor： ROEHRSCHEID FREIMUND DR ,  GROETSCH GEORG DR

IPC: B01J27/08 ,  C07B61/00 ,  C07C51/265 ,  C07C51/29 ,  C07C63/04 ,  C07C63/70 ,  C07C65/34 ,  C07C63/68 ,  C07C63/72 ,  C07C65/32

Abstract: Prepn. of bromo- or chloro-aromatic carboxylic acids (I) involves oxidn. of the corresp. halo-alkyl-aromatics (II) with (gas contg.) O2 in acetic acid as solvent and in the presence of a transition metal bromide as catalyst. The novel features are that: (a) the reaction mixt. contains a Na and/or K salt of a weak acid; (b) the reaction soln. is cooled when reaction has ceased and the crystalline prod. is filtered off; (c) the combined mother liquor and washings are dehydrated by distn. to reduce the water content to at most 1.0%; (d) the pptd. alkali halide is filtered from the mother liquor and (e) the mother liquor is recycled as reaction medium.

公开(公告)号：DE4334431A1

公开(公告)日：1995-04-13

申请号：DE4334431

申请日：1993-10-08

Applicant: HOECHST AG

Inventor： ROEHRSCHEID FREIMUND DR ,  RAPP JOCHEN DR ,  PAPENFUHS THEODOR DR

IPC: B01J27/128 ,  C07B61/00 ,  C07C51/265 ,  C07C63/70 ,  C07C227/08 ,  C07C229/56 ,  C07C227/12 ,  C07C227/02 ,  C07C227/40

Abstract: The present invention relates to a process for the preparation of 5-fluoroanthranilic acid by reacting 5-fluoro-2-bromotoluene with oxygen or an oxygen-containing gas at 80 to 220 DEG C in the presence of a catalyst and of an acidic solvent, separating off the 5-fluoro-2-bromobenzoic acid formed and reacting with ammonia at 70 to 180 DEG C.

公开(公告)号：AT113048T

公开(公告)日：1994-11-15

申请号：AT89113945

申请日：1989-07-28

Applicant: HOECHST AG

Inventor： ROEHRSCHEID FREIMUND DR

IPC: C07D307/89 ,  C07C63/72 ,  C07D493/04 ,  C08G73/10

Abstract: A process for the preparation of high-purity perfluorinated compounds, specifically of an aromatic tetracarboxylic acid and its anhydride, 5,5'-[2,2,2-trifluoro-1-(trifluoromethyl)-ethylidene]bis-1,3-isobenzof urandione, by a multi-step treatment of the crude compounds. The metal ion content of the compounds treated is reduced considerably. After polymerization with an aromatic diamine, the anhydride is used in microelectronics.

公开(公告)号：DE58903652D1

公开(公告)日：1993-04-08

申请号：DE58903652

申请日：1989-09-28

Applicant: HOECHST AG

Inventor： LAU JUERGEN DR ,  SIEGEMUND GUENTER DR ,  ROEHRSCHEID FREIMUND DR

IPC: C07C205/58 ,  C07C209/00 ,  C07C211/52 ,  C07C229/52 ,  C07C233/65 ,  C07C237/30 ,  C07C245/08 ,  C08G69/26