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    32.
    发明专利
    未知

    公开(公告)号：DE3860299D1

    公开(公告)日：1990-08-16

    申请号：DE3860299

    申请日：1988-03-03

    Applicant: RHONE POULENC CHIMIE

    Inventor： DESMURS JEAN-ROGER ,  JOUVE ISABELLE

    IPC: C07C67/00 ,  C07C201/00 ,  C07C205/22 ,  C07C205/26

    Abstract: The chloronitrophenols, e.g., 2,6-dichloro-4-nitrophenol (a known agrochemical/pharmaceutical intermediate), are efficiently prepared by chlorinating ortho- or para-nitrophenol with gaseous chlorine, characteristically in the molten state, and in the presence of a catalytically effective amount of a primary, secondary or tertiary amine.

    35.
    发明专利
    未知

    公开(公告)号：DE69915061T2

    公开(公告)日：2005-02-03

    申请号：DE69915061

    申请日：1999-06-16

    Applicant: RHONE POULENC CHIMIE

    Inventor： JOUVE ISABELLE ,  FOURNET FREDERIC ,  FRAGNON JEAN

    IPC: C07C51/353 ,  C07B61/00 ,  C07C45/27 ,  C07C45/67 ,  C07C51/367 ,  C07C51/373 ,  C07C51/377 ,  C07C59/52 ,  C07C59/64 ,  C07C59/84

    Abstract: The invention concerns a method for preparing p-hydroxymandelic compounds optionally substituted and their derivatives. More particularly, it concerns a method for preparing p-hydroxymandelic acid and methoxy-3 p-hydroxymandelic acid and their derivatives. The invention concerns a method for preparing p-hydroxymandelic compounds optionally substituted and their derivatives, which consists in condensing in water, in the presence of an alkaline agent, an aromatic compound bearing at least a hydroxyl group and whereof the position in para is free, with glyoxylic acid, said method being characterised in that the reaction is carried out in the presence of an efficient amount of a compound bearing at least two carboxylic functions.

    36.
    发明专利
    未知

    公开(公告)号：DE69609806D1

    公开(公告)日：2000-09-21

    申请号：DE69609806

    申请日：1996-02-14

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL ,  JOUVE ISABELLE ,  MALIVERNEY CHRISTIAN

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

    Abstract: PCT No. PCT/FR96/00241 Sec. 371 Date Oct. 16, 1996 Sec. 102(e) Date Oct. 16, 1996 PCT Filed Feb. 14, 1996 PCT Pub. No. WO96/26175 PCT Pub. Date Aug. 29, 1996The subject of the present invention is a process for the preparation of a 4-hydroxybenzaldehyde carrying at least one substituent in the position ortho to the OH group. It more particularly relates to the preparation of 3-methoxy-4-hydroxybenzaldehyde and of 3-ethoxy-4-hydroxybenzaldehyde. The process for the preparation of a substituted 4-hydroxybenzaldlehyde, substituted at least in the 3 position by an alkoxy group, is characterized in that it comprises subjecting a substituted phenol compound, substituted at least in the 2 position by an alkoxy group and in which the 4 and 6 positions are free, to a first stage of carboxylation in the 6 position, then to a stage of hydroxymethylation in the 4 position, followed by a stage of oxidation of the hydroxymethyl group to a formyl group, and finally to a last decarboxylation stage.\!

    37.
    发明专利
    未知

    公开(公告)号：BR9605182A

    公开(公告)日：1997-10-14

    申请号：BR9605182

    申请日：1996-02-14

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL ,  JOUVE ISABELLE ,  MALIVERNEY CHRISTIAN

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

    Abstract: PCT No. PCT/FR96/00241 Sec. 371 Date Oct. 16, 1996 Sec. 102(e) Date Oct. 16, 1996 PCT Filed Feb. 14, 1996 PCT Pub. No. WO96/26175 PCT Pub. Date Aug. 29, 1996The subject of the present invention is a process for the preparation of a 4-hydroxybenzaldehyde carrying at least one substituent in the position ortho to the OH group. It more particularly relates to the preparation of 3-methoxy-4-hydroxybenzaldehyde and of 3-ethoxy-4-hydroxybenzaldehyde. The process for the preparation of a substituted 4-hydroxybenzaldlehyde, substituted at least in the 3 position by an alkoxy group, is characterized in that it comprises subjecting a substituted phenol compound, substituted at least in the 2 position by an alkoxy group and in which the 4 and 6 positions are free, to a first stage of carboxylation in the 6 position, then to a stage of hydroxymethylation in the 4 position, followed by a stage of oxidation of the hydroxymethyl group to a formyl group, and finally to a last decarboxylation stage.\!

    39.
    发明专利
    未知

    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.

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