公开(公告)号：DE3869212D1

公开(公告)日：1992-04-23

申请号：DE3869212

申请日：1988-06-01

Applicant: HOECHST AG

Inventor： DAPPERHELD STEFFEN DR ,  SCHWERTFEGER WERNER DR ,  WILDT MANFRED

IPC: C07C69/675 ,  C07C43/17 ,  C25B3/25 ,  C25B3/28 ,  C25B3/08 ,  C25B3/04

Abstract: Fluoro-vinyl ethers of formula R1-O-CH=CH2 (I) are prepd. by splitting halogen from cpds. of formula R1-O-CH(R2)-CF2(R3) (II), by electrolysing (II) in an opt. divided electrolysis cell, in an organic liq. (opt. contg. water), at between -20 deg.C and the b.pt. of the electrolyte or catholyte, at current density 1-500 mA/sq.cm., on a cathode of Pb, Cd, Zn, Cu, Sn, Zr, Hg, alloys of these metals or C. In the formulae, R1=R4-CXY-(CF2)n-CF(R5)- (O-CF(CF3)-CF2)m; R4=F, Cl or 1-3C perfluoro alkyl; R5=F or 1-3C perfluoroalkyl; X=F, Cl, Br, iodine, H, O-alkyl, COO-alkyl or SO2F; Y=F or Cl; n=0-10; m=0-5; R2, R3=Cl or Br.

公开(公告)号：AU1190788A

公开(公告)日：1988-08-18

申请号：AU1190788

申请日：1988-02-17

Applicant: HOECHST AG

Inventor： DAPPERHELD STEFFEN ,  HEUMULLER RUDOLF ,  WILDT MANFRED

IPC: C25B3/25 ,  C07C121/30 ,  C07B59/00 ,  C07C51/377 ,  C07C57/54 ,  C07C57/065 ,  C07C67/317 ,  C07C69/54 ,  C07C120/00 ,  C07C121/16

Abstract: The existing processes for the preparation of halogenoacrylic acids and deuterated derivatives thereof have to be carried out using chemicals which are in some cases very toxic or very expensive. Electrochemical reduction, however, makes it possible to eliminate one or more halogen atoms selectively from halogenoacrylic and halogenomethacrylic acids and derivatives thereof, and to replace these by hydrogen or deuterium atoms. This is effected by electrolyzing the acids or derivatives thereof in a solution containing water or deuterium oxide at a temperature from -10 DEG C. up to the boiling point of the electrolysis liquid.

公开(公告)号：DE19548428C1

公开(公告)日：1997-08-28

申请号：DE19548428

申请日：1995-12-22

Applicant: HOECHST AG

Inventor： BRUNGS PETER DR ,  KARCHER THOMAS DR ,  KUEHLEIN KLAUS PROF DR ,  MILLAUER HANS DR ,  WILDT MANFRED

IPC: C07C67/08 ,  C07C51/15 ,  C07C67/03 ,  C07C69/76 ,  C07C69/78 ,  C07C319/14 ,  C07C323/62 ,  C25B3/23 ,  C25B3/10 ,  C07C63/70

Abstract: Alkyl 2-alkylmercapto-4-trifluoromethyl-benzoates of formula (II) are new. R1, R2 = 1-6C alkyl. Also claimed is the preparation of (II) by electrochemical reaction of 3,4-dichloro-(trifluoromethyl)benzene (III) with carbon dioxide at the anode, to give 2-chloro-4-(trifluoromethyl)benzoate (IV); esterification of (IV) to give alkyl 2-chloro-4-(trifluoromethyl)benzoate of formula (I), and reaction with an alkyl mercaptide of formula R2S . (I) are new.

公开(公告)号：CA2092693A1

公开(公告)日：1992-03-14

申请号：CA2092693

申请日：1991-09-12

Applicant: HOECHST AG

Inventor： DAPPERHELD STEFFEN ,  HEUMUELLER RUDOLF ,  ULMSCHNEIDER DIETER ,  WILDT MANFRED

IPC: C25B3/28 ,  C25B3/25 ,  C25B3/06

Abstract: WO 92/05299 PCT/EP91/0173B Process for the preparation of halogenated acrylic acids Process for the preparation of compounds of the formula (I) (I) by electrolytic reduction. R1 is a fluorine atom or a methyl or deuteromethyl group; R2 and R3 are identical or different and are a fluorine, chlorine, hydrogen or deuterium atom; R4 is a group, in which R5 is -OH, -OD, C1-C4-alkoxy or -OMe, where Me = alkali metal, alkaline earth metal or NH4 ion. A compound of the formula (II) (II) or a compound of the formula (III) (III) (R1, R2, R3 and R4 have the abovementioned meaning; R6 is a chlorine atom) is subjected to electrolysis in an undivided or divided cell in an electrolysis liquid in the presence of iron salts, which are present in the electrolyte in a concentration of 1 to 500 ppm,

公开(公告)号：AT72269T

公开(公告)日：1992-02-15

申请号：AT88115288

申请日：1988-09-17

Applicant: HOECHST AG

Inventor： DAPPERHELD STEFFEN DR ,  HEUMUELLER RUDOLF DR ,  WILDT MANFRED

IPC: C25B3/28 ,  C25B3/25 ,  C25B3/04

公开(公告)号：CA2156359A1

公开(公告)日：1996-02-19

申请号：CA2156359

申请日：1995-08-17

Applicant: HOECHST AG

Inventor： KARCHER THOMAS ,  MILLAUER HANS ,  WILDT MANFRED

IPC: C23F13/00 ,  C25B9/00 ,  C25B9/12 ,  C25B3/00

Abstract: The electrolytic cell having sacrificial anodes, which is provided with a feed line and a discharge line for electrolyte, comprises, stacked in a container (1), electrodes (4, 5) which are separated from one another by spacers (6) which form an electrode gap (7). The stack is provided with a guiding device (8) in which the individual electrodes (4, 5) are arranged slidingly. The individual electrodes (4, 5) have openings which in the case of stacked electrodes (4, 5) form a duct (9) for supplying the electrolyte into the electrode gaps (7), one end of the duct (9) being connected to the feed line (2) for electrolyte and its other end being closed.

公开(公告)号：DE4029067A1

公开(公告)日：1992-03-19

申请号：DE4029067

申请日：1990-09-13

Applicant: HOECHST AG

Inventor： DAPPERHELD STEFFEN DR ,  HEUMUELLER RUDOLF DR ,  WILDT MANFRED

IPC: C08F20/02 ,  C07B59/00 ,  C07C51/09 ,  C07C57/54 ,  C08F20/04 ,  C08F20/10

Abstract: A process is disclosed for producing compounds having formula (I), in which n = 1, 2 or 3, by reaction of compounds having formula (V), in which R is a hydrogen or deuterium atom, with equimolar amounts of a base in water or an organic solvent, or in a mixture of water with one or several organic solvents, at a temperature in a range between the setting and boiling points of the reaction solution. A is a NH4 or a NH3D group, a metal M , preferably an alkali or alkaline earth metal, or a primary, secondary, tertiary or quaternary ammonium ion having formula (II), or a residue having formula (III).

公开(公告)号：AT65555T

公开(公告)日：1991-08-15

申请号：AT88102011

申请日：1988-02-11

Applicant: HOECHST AG

Inventor： DAPPERHELD STEFFEN DR ,  HEUMUELLER RUDOLF DR ,  WILDT MANFRED

IPC: C25B3/25 ,  C25B3/04

公开(公告)号：DE3731914A1

公开(公告)日：1989-04-06

申请号：DE3731914

申请日：1987-09-23

Applicant: HOECHST AG

Inventor： DAPPERHELD STEFFEN DR ,  HEUMUELLER RUDOLF DR ,  WILDT MANFRED

IPC: C25B3/28 ,  C25B3/25

Abstract: The previous processes for the production of halogenated acrylic acids and their deuterised derivatives have to be carried out using chemicals, some of which are very toxic or very expensive. However, it is possible to produce fluorinated acrylic acids by electrochemically detaching halogen atoms from halogenated fluoropropionic acids and their derivatives. For this purpose, the acids or their derivatives are electrolysed in a solution containing water at the temperature of from -10 DEG C to the boiling point of the electrolysis liquid.

公开(公告)号：DE3718726A1

公开(公告)日：1988-12-22

申请号：DE3718726

申请日：1987-06-04

Applicant: HOECHST AG

Inventor： DAPPERHELD STEFFEN DR ,  SCHWERTFEGER WERNER K DR ,  WILDT MANFRED

IPC: C07C69/675 ,  C07C43/17 ,  C25B3/25 ,  C25B3/28 ,  C25B3/00 ,  C07C43/12

Abstract: The invention relates to a process for preparing compounds of the formula (I) R1-O-CF=CF2 by elimination of halogen atoms from compounds of the formula (II) by electrolysis. The compounds of the formula (II) are electrolyzed in an undivided or divided electrolysis cell in an organic liquid which can also contain water at a temperature from -20 DEG C. to the boiling temperature of the electrolyte or catholyte at a current density of 1-500 mA/cm2 at a cathode made of lead, cadmium, zinc, copper, tin, zirconium, mercury, alloys of these metals or carbon.