Title:
4―ヒドロキシベンズアルデヒドおよびその誘導体の製造方法
Document Type and Number:
Japanese Patent JP4282768
Kind Code:
B2
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.
Inventors:
Whip, pascal
Application Number:
JP52328798A
Publication Date:
June 24, 2009
Filing Date:
November 19, 1997
Export Citation:
Assignee:
Rodia Simi
International Classes:
B01J23/68; C07C37/20; C07C45/65; C07C39/11; C07C41/18; C07C41/30; C07C43/23; C07C45/38; C07C45/67; C07C47/575; C07C47/58; C07C51/235; C07C51/255; C07C65/42
Domestic Patent References:
| JP10503781A | ||||
| JP4202152A |
Foreign References:
| US4351962 |
Attorney, Agent or Firm:
Yoshio Kawaguchi
Naoya Fushimi
Natsuo Tanaka
Naoya Fushimi
Natsuo Tanaka