公开(公告)号：ZA9609210B

公开(公告)日：1997-09-23

申请号：ZA9609210

申请日：1996-11-01

Applicant: RHONE POULENC CHIMIE

Inventor： METIVIER PASCAL

IPC: C07B20060101 ,  C07C20060101 ,  C07C ,  C07B

公开(公告)号：FR2734565B1

公开(公告)日：1997-07-04

申请号：FR9506186

申请日：1995-05-24

Applicant: RHONE POULENC CHIMIE

Inventor： METIVIER PASCAL

IPC: B01J23/42 ,  B01J23/44 ,  C07B61/00 ,  C07C45/38 ,  C07C45/65 ,  C07C45/67 ,  C07C47/575 ,  C07C47/58 ,  C07C51/255 ,  C07C65/30 ,  C07C201/12 ,  C07C205/61

Abstract: PCT No. PCT/FR96/00779 Sec. 371 Date Jan. 24, 1997 Sec. 102(e) Date Jan. 24, 1997 PCT Filed May 24, 1996 PCT Pub. No. WO96/37454 PCT Pub. Date Nov. 28, 1996The present invention concerns a process for the preparation of 3-carboxy-4-hydroxybenzaldehydes and derivatives thereof from phenolic compounds carrying formyl and/or hydroxymethyl groups in the 2 and 4 positions. The invention also concerns the preparation of 4-hydroxybenzaldehydes from 3-carboxy-4-hydroxybenzaldehydes. More particularly, the invention concerns the preparation of 3-methoxy-4-hydroxybenzaldehyde and 3-ethoxy-4-hydroxybenzaldehyde, respectively known as "vanillin" and "ethylvanillin". The process for the preparation of 3-carboxy-4-hydroxybenzaldehyde is characterized in that the group in the 2 position in a phenolic compound carrying formyl and/or hydroxymethyl groups in the 2 and 4 positions is selectively oxidized to a carboxy group, and optionally a hydroxymethyl group in the 4 position is selectively oxidized to a formyl group. A successive decarboxylation step for a 3-carboxy-4-hydroxybenzaldehyde produces a 4-hydroxybenzaldehyde.

公开(公告)号：BR9504023A

公开(公告)日：1996-09-24

申请号：BR9504023

申请日：1995-09-14

Applicant: RHONE POULENC CHIMIE

Inventor： DOS SANTOS EMMANUEL ,  METIVIER PASCAL

IPC: B01J27/13 ,  B01J27/188 ,  B01J27/19 ,  B01J31/04 ,  C07B61/00 ,  C07C51/16 ,  C07C51/27 ,  C07C51/285 ,  C07C53/124 ,  C07C55/00 ,  C07C55/16 ,  C07C55/18 ,  C07C69/24 ,  C07C69/347 ,  C07C69/44 ,  C11C3/00 ,  C07C53/126 ,  C07C55/02 ,  C07C67/04 ,  C07C69/22 ,  C07C69/34

Abstract: Prepn. of mono- and di-carboxylic acids from unsatd. fatty acids and/or derivs., comprises: (i) oxidising an unsatd. fatty acid, in the form of an acid and/or ester, with hydrogen peroxide in presence of a metal oxide or a carboxylic acid, opt. with a ruthenium catalyst; (ii) reacting the mixt. with nitric acid in presence of a vanadium catalyst, opt. with a co-catalyst; and (iii) recovering the mono- and di-carboxylic acids. The starting material is pref. a fatty acid with at least one double bond, an animal fat or oil, a vegetable oil, an ester of a pptd. fatty acid and is pref. oleic, colza, sunflower and soya oil. The ruthenium catalyst is pref. present in amt. of 1-35 % w.r.t. H2O2. H2O2 may be used with a gp. VIa metal catalyst, esp. a W and/or Mo catalyst in amt. of 1-35 (pref. 3-10) %, w.r.t. H2O2. The vanadium catalyst may be a V halide, a V oxide, a V oxyhalide, a V or vanadyl sulphate, an alkali metal or ammonium vanadate, or V acetylacetonate. The optional V co-catalyst may be based on a Gp. VIIa or VIII metal. A stoichiometric amt. of H2O2 or a 0-50 % excess is used with a carboxylic acid in a hydrogen peroxide : carboxylic acid molar ratio of 10-500 (pref. 10-40) %.

公开(公告)号：FR2730731A1

公开(公告)日：1996-08-23

申请号：FR9501927

申请日：1995-02-20

Applicant: RHONE POULENC CHIMIE

Inventor： METIVIER PASCAL ,  DOS SANTOS EMMANUEL

IPC: C07C51/15 ,  C07C65/21 ,  C07C47/58

Abstract: A method for carboxylating a phenol ether, particularly guaiacol and guetol, wherein said phenol ether in salt form is reacted with carbon dioxide at a temperature below 150 DEG C in an aprotic, polar and basic organic solvent.

公开(公告)号：FR2730730A1

公开(公告)日：1996-08-23

申请号：FR9501926

申请日：1995-02-20

Applicant: RHONE POULENC CHIMIE

Inventor： METIVIER PASCAL ,  MALIVERNEY CHRISTIAN ,  JOUVE ISABELLE

IPC: B01J27/053 ,  C07B61/00 ,  C07C45/65 ,  C07C45/67 ,  C07C47/575 ,  C07C47/58 ,  C07C51/15 ,  C07C51/353 ,  C07C51/367 ,  C07C51/373 ,  C07C65/21

Abstract: A method for preparing a 4-hydroxybenzaldehyde having at least one substituent in the ortho position of the OH group, is disclosed. In particular, the preparation of 3-methoxy-4-hydroxybenzaldehyde and 3-ethoxy-4-hydroxybenzaldehyde is disclosed. The method for preparing a 4-hydroxybenzaldehyde which is at least 3-substituted by an alkoxy group comprises a step wherein a phenol compound which is at least 2-substituted by an alkoxy group and has positions 4 and 6 free is carboxylated in position 6 then hydroxymethylated in position 4, followed by a step of oxidising the hydroxymethyl group to a formyl group, and finally a decarboxylation step.

公开(公告)号：FR2724378A1

公开(公告)日：1996-03-15

申请号：FR9410781

申请日：1994-09-09

Applicant: RHONE POULENC CHIMIE

Inventor： METIVIER PASCAL ,  BERNARD LAURENT

IPC: C06B25/04 ,  C07C205/24 ,  C07C201/08

Abstract: Prepn. of picric acid comprises nitrating o-nitrophenol and/or p-nitrophenol to dinitrophenols such that the intermediate(s) formed remain soluble in the reaction medium. Nitration is then continued to obtain picric acid which pptes. Either nitric acid or the nitrating mixt. is introduced into the nitrophenol; or the nitrophenol is progressively introduced to the reaction medium comprising nitric acid or the nitrating mixt.; or the nitrophenol and the nitric acid or nitrating mixt. are simultaneously introduced on a first bottoms mixt. comprising water or co-acid. The nitrating mixt. is nitric acid associated with a strong co-acid.

公开(公告)号：FR2699168B1

公开(公告)日：1995-01-13

申请号：FR9215206

申请日：1992-12-11

Applicant: RHONE POULENC CHIMIE

Inventor： SANTOS EMMANUEL DOS ,  METIVIER PASCAL ,  GUBELMANN MICHEL

IPC: B01J21/06 ,  B01J23/16 ,  B01J23/46 ,  B01J23/70 ,  C07C51/06 ,  C07C55/00 ,  C07C55/10 ,  C07C55/12 ,  C07C55/14 ,  C07C55/02 ,  C07C51/353

Abstract: PCT No. PCT/FR93/01232 Sec. 371 Date Jul. 23, 1995 Sec. 102(e) Date Jul. 23, 1995 PCT Filed Dec. 10, 1993 PCT Pub. No. WO94/13616 PCT Pub. Date Jun. 23, 1994Process for the treatment of a material comprising a polymer, especially a polyamide. The process consists in subjecting the polyamide to hydrolysis in the presence of a hydrolyzing nitrous grouping and transforming the hydrolyzed compounds into diacids. The treatment of a polyamide 6.6 results in the recovery of adipic acid and other diacids corresponding to the participating acid monomer and to the transformation of at least one part of the diamine monomer into diacids.

公开(公告)号：DE69002694T2

公开(公告)日：1994-01-05

申请号：DE69002694

申请日：1990-05-29

Applicant: RHONE POULENC CHIMIE

Inventor： METIVIER PASCAL ,  RAJOHARISSON HARVELO

IPC: C07C67/307 ,  C07C67/327 ,  C07C69/63 ,  C07D213/63 ,  C07D307/58 ,  C07D333/32

Abstract: Process for the preparation of optically active 2-chloropropionic acid esters of formula … … COOR1 being a hydrolysable group from an optically active lactate of formula … … with inversion of configuration by bringing the lactate (II) into contact with SOCl2 followed by decomposition of the chlorosulphite formed, the said process being characterised in that at least the decomposition stage is carried out in the presence of ether.

公开(公告)号：CA2190030C

公开(公告)日：2008-10-07

申请号：CA2190030

申请日：1996-05-24

Applicant: RHONE POULENC CHIMIE

Inventor： METIVIER PASCAL

IPC: B01J23/42 ,  C07C51/265 ,  B01J23/44 ,  C07B61/00 ,  C07C45/38 ,  C07C45/65 ,  C07C45/67 ,  C07C45/78 ,  C07C47/575 ,  C07C47/58 ,  C07C51/235 ,  C07C51/255 ,  C07C65/30 ,  C07C201/12 ,  C07C205/61

Abstract: La présente invention a pour objet un procédé de préparation de 3-carboxy-4- hydroxybenzaldéhydes et dérivés, à partir de composés phénoliques porteurs de groupes formyle et/ou hydroxyméthyle en position 2 et 4. Un autre objet de l'invention est la préparation de 4-hydroxybenzaldéhydes à partir de 3-carboxy-4-hydroxybenzaldehydes. L'invention concerne plus particulièrement la préparation du 3-méthoxy-4-hydroxybenzaldéhyde et du 3-éthoxy-4-hydroxybenzaldéhyde dénommés respectivement "vanilline" et "éthylvanilline". Le procédé de préparation d'un 3-carboxy-4-hydroxybenzaldéhyde est caractérisé par le fait l'on soumet un composé phénolique porteur de groupes formyle et/ou hydroxyméthyle en position 2 et 4 à une oxydation sélective du groupe en position 2 en groupe carboxylique, et éventuellement d'un groupe hydroxyméthyle en position 4 en groupe formyle. Une étape successive de décarboxylation d'un 3-carboxy-4 hydroxybenzaldéhyde conduit à un 4-hydroxybenzaldéhyde.

公开(公告)号：DE69714288T2

公开(公告)日：2003-03-06

申请号：DE69714288

申请日：1997-11-19

Applicant: RHONE POULENC CHIMIE

Inventor： METIVIER PASCAL

IPC: B01J23/68 ,  C07C37/20 ,  C07C39/11 ,  C07C41/18 ,  C07C41/30 ,  C07C43/23 ,  C07C45/38 ,  C07C45/65 ,  C07C45/67 ,  C07C47/575 ,  C07C47/58 ,  C07C51/235 ,  C07C51/255 ,  C07C65/42

Abstract: The present invention concerns a process for the preparation of a 4-hydroxybenzaldehyde and its derivatives. More particularly, the invention concerns the preparation of 3-methoxy-4-hydroxybenzaldehyde and 3-ethoxy-4-hydroxybenzaldehyde, respectively known as vanillin and ethylvanillin. The process for the preparation of a 4-hydroxybenzaldehyde and its derivatives is characterized in that it consists of selectively oxidising, to a carboxy group, the group in the 2 position with respect to the hydroxyl group, present in the phenolic compounds in a mixture comprising at least a phenolic compound (A) carrying formyl and/or hydroxymethyl groups in the 2 and 4 position, a phenolic compound (B) carrying a formyl or hydroxymethyl group in the 4 position, a phenolic compound (C) carrying a formyl or hydroxymethyl group in the 2 position, resulting in a mixture comprising a 3-carboxy-4-hydroxybenzaldehyde, a 4-hydroxybenzaldehyde and a 2-hydroxybenzoic acid, which then undergoes a decarboxylation operation to produce the 4-hydroxybenzaldehyde and a phenol which can optionally be recycled.