基本信息:
- 专利标题： PROCEDE DE PREPARATION D'UN 4-HYDROXYBENZALDEHYDE ET DERIVES
- 专利标题（英）：Method for preparing a 4-hydroxybenzaldehyde and derivatives
- 专利标题（中）：用于生产4-羟基苯甲醛及其衍生物
- 申请号：EP97947095.2 申请日：1997-11-19
- 公开(公告)号：EP0946482B1 公开(公告)日：2002-07-24
- 发明人： METIVIER, Pascal
- 申请人： RHODIA CHIMIE
- 申请人地址： 25, quai Paul Doumer 92408 Courbevoie Cédex FR
- 专利权人： RHODIA CHIMIE
- 当前专利权人： RHODIA CHIMIE
- 当前专利权人地址： 25, quai Paul Doumer 92408 Courbevoie Cédex FR
- 代理机构： Dutruc-Rosset, Marie-Claude
- 优先权： FR9614275 19961122
- 国际公布： WO9822419 19980528
- 主分类号： C07C45/67
- IPC分类号： C07C45/67 ; C07C45/38 ; C07C51/255 ; C07C41/30 ; C07C37/20 ; C07C47/575 ; C07C47/58
摘要：
The invention concerns a method for preparing a 4-hydroxybenzaldehyde and derivatives. More particularly it concerns the preparation of 3-methoxy-4-hydroxybenzaldehyde and of 3-ethoxy-4-hydroxybenzaldehyde called 'vanillin' and 'ethylvanillin' respectively. The method for preparing a 4-hydroxybenzaldehyde and derivatives is characterised in that it consists in selectively oxidising the group in position 2 relative to the hydroxyl group, in carboxylic group, present in the phenolic compounds of a mixture containing at least: a phenolic compound (A) bearing formyl and/or hydroxymethyl groups in position 2 and 4; a phenolic compound (B) bearing a formyl or hydroxymethyl group in position 4; a phenolic compound (C) bearing a formyl or hydroxymethyl group in position 2; thus leading to a mixture containing a 3-carboxy-4-hydroxybenzaldehyde, a 4-hydroxybenzaldehyde, a 2-hydroxybenzoic acid, which is then subjected to a decarboxylation for obtaining the 4-hydroxybenzaldehyde and a phenol which can be optionally recycled.