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    1.
    发明专利
    未知

    公开(公告)号：DE69731967D1

    公开(公告)日：2005-01-20

    申请号：DE69731967

    申请日：1997-10-13

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL ,  MALIVERNEY CHRISTIAN ,  DENIS PHILIPPE

    IPC: B01J23/644 ,  C07B61/00 ,  C07C45/38 ,  C07C47/565 ,  C07C47/575 ,  C07C47/58 ,  C07C51/255 ,  C07C65/05

    Abstract: The present invention concerns a process for the preparation of a 2-hydroxybenzoic acid and of a 4-hydroxybenzaldehyde and derivatives thereof from a mixture of two phenolic compounds, one carrying a formyl or hydroxymethyl group in the 2 position, and the other carrying a formyl or hydroxymethyl group in the 4 position. The invention also concerns the preparation of a 4-hydroxybenzaldehyde from said mixture. The invention more particularly concerns the preparation of 3-methoxy-4-hydroxybenzaldehyde and of 3-ethoxy4-hydroxybenzaldehyde, respectively known as "vanillin" and ethylvanillin". The process for the preparation of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde and derivatives thereof is characterised in that the formyl or hydroxymethyl group in the 2 position of compound (A) in a mixture of phenolic compounds, one (A) carrying a formyl or hydroxymethyl group in the 2 position, and the other (B) carrying a formyl or hydroxymethyl group in the 4 position, is selectively oxidised to a carboxy group and optionally a hydroxymethyl group of compound (B) in the 4 position is selectively oxidised to a formyl group, thus producing a mixture of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde.

    2.
    发明专利
    未知

    公开(公告)号：DE69802755D1

    公开(公告)日：2002-01-17

    申请号：DE69802755

    申请日：1998-08-11

    Applicant: RHONE POULENC CHIMIE

    Inventor： MARION PHILIPPE ,  METIVIER PASCAL

    IPC: C07C201/16

    Abstract: A treatment process is claimed of a flux obtained from (1) a dinitration reaction of an aromatic compound with a nitrating mixture containing nitric acid, then (2) separation of the nitrating acid; the flux comprises a dinitrated aromatic compound in which a fraction of the nitrating acid remains. The process comprises the following stages:- a) distillation or stripping of the flux; b) recycling of the nitric acid recovered at the column head in the nitration process; c) treatment of the flux free of nitric acid containing dinitrated aromatics, by washing.

    3.
    发明专利
    未知

    公开(公告)号：DE69610396D1

    公开(公告)日：2000-10-26

    申请号：DE69610396

    申请日：1996-05-24

    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.

    4.
    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.\!

    Method for selective preparation of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde and derivatives
    6.
    发明专利
    Method for selective preparation of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde and derivatives 未知

    公开(公告)号：AU4709497A

    公开(公告)日：1998-05-11

    申请号：AU4709497

    申请日：1997-10-13

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL ,  MALIVERNEY CHRISTIAN ,  DENIS PHILIPPE

    IPC: B01J23/644 ,  C07B61/00 ,  C07C45/38 ,  C07C47/565 ,  C07C47/575 ,  C07C47/58 ,  C07C51/255 ,  C07C65/05

    Abstract: The present invention concerns a process for the preparation of a 2-hydroxybenzoic acid and of a 4-hydroxybenzaldehyde and derivatives thereof from a mixture of two phenolic compounds, one carrying a formyl or hydroxymethyl group in the 2 position, and the other carrying a formyl or hydroxymethyl group in the 4 position. The invention also concerns the preparation of a 4-hydroxybenzaldehyde from said mixture. The invention more particularly concerns the preparation of 3-methoxy-4-hydroxybenzaldehyde and of 3-ethoxy4-hydroxybenzaldehyde, respectively known as "vanillin" and ethylvanillin". The process for the preparation of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde and derivatives thereof is characterised in that the formyl or hydroxymethyl group in the 2 position of compound (A) in a mixture of phenolic compounds, one (A) carrying a formyl or hydroxymethyl group in the 2 position, and the other (B) carrying a formyl or hydroxymethyl group in the 4 position, is selectively oxidised to a carboxy group and optionally a hydroxymethyl group of compound (B) in the 4 position is selectively oxidised to a formyl group, thus producing a mixture of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde.

    8.
    发明专利
    未知

    公开(公告)号：FR2750986A1

    公开(公告)日：1998-01-16

    申请号：FR9608725

    申请日：1996-07-12

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL

    IPC: B01J31/02 ,  C07B43/02 ,  C07B61/00 ,  C07C201/00 ,  C07C201/10 ,  C07C205/22 ,  C07C205/44 ,  C07C205/45 ,  C07C205/60 ,  C07C207/04 ,  C07C227/04 ,  C07C227/06 ,  C07C229/64 ,  C07C201/08

    Abstract: The invention concerns a method of nitrosation of a phenolic compound substituted by an electro-attracting group.The invention also concerns a method of nitration of a phenoic compound substituted by an electro-attracting group. The nitrosation method is characterised in that it consists in effecting the nitrosatio n of the said compound in presence of sulphuric acid; the concentration of the sulphuric acid being at least 60 % by weight, then optionally in effecting the separation of the resulting nitrosated compound. The invention also concerns the oxidation of the resulting p-nitrosated phenolic compound for obtaining the corresponding nitrated compound.

    9.
    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.\!

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