Title:
3-カルボキシ-4-ヒドロキシベンズアルデヒドおよびそれらの誘導体の製造方法
Document Type and Number:
Japanese Patent JP4021478
Kind Code:
B2
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.
Inventors:
Metevie, Pascal
Application Number:
JP53153696A
Publication Date:
December 12, 2007
Filing Date:
May 24, 1996
Export Citation:
Assignee:
Rhone-Poulin stain
International Classes:
B01J23/42; B01J23/44; C07C65/30; C07B61/00; C07C45/38; C07C45/65; C07C45/67; C07C47/575; C07C47/58; C07C51/255; C07C201/12; C07C205/61
Domestic Patent References:
| JP4266841A | ||||
| JP6116205A | ||||
| JP52136141A | ||||
| JP72600C2 |
Foreign References:
| US4351962 |
Attorney, Agent or Firm:
Yoshio Kawaguchi
Toru Nakamura
Takeshi Funayama
Naoya Fushimi
Toru Nakamura
Takeshi Funayama
Naoya Fushimi