Process for the preparation of aromatic hydroxy carboxylic acids
    3.
    发明授权
    Process for the preparation of aromatic hydroxy carboxylic acids 失效
    芳香族羟基羧酸的制备方法

    公开(公告)号:US5643494A

    公开(公告)日:1997-07-01

    申请号:US456499

    申请日:1995-06-01

    CPC分类号: C07C51/10

    摘要: A process for the preparation of aromatic hydroxy carboxylic acids by reacting alkali metal phenolates or alkali metal naphtholates with alkali metal carbonates and carbon monoxide, with subsequent acidification, wherein the solid starting materials--alkali metal carbonate and/or alkali metal phenolate or naphtholate--are metered into the reaction mixture in the form of one or more dispersions in an inert organic liquid.The process according to the invention enables the preparation of aromatic hydroxy carboxylic acids in good yields and with high chemical selectivity. Additional measures for increasing the selectivity, as described for example for the Kolbe-Schmitt reaction in EP-A 0 053 824, EP-A 0 081 753 and EP-A 0 254 596, and for the reaction with CO and carbonate in, for example, WO 91/11422, are unnecessary.

    摘要翻译: 一种通过碱金属酚盐或碱金属碳酸盐和一氧化碳与碱金属碳酸盐和一氧化碳反应制备芳族羟基羧酸的方法,随后酸化,其中固体原料 - 碱金属碳酸盐和/或碱金属酚盐或萘甲酸盐是 在惰性有机液体中以一种或多种分散体的形式计量加入到反应混合物中。 根据本发明的方法能够以良好的产率和高的化学选择性制备芳族羟基羧酸。 增加选择性的附加措施,例如在EP-A 0 053 824,EP-A 0 081 753和EP-A 0 254 596中描述的Kolbe-Schmitt反应,以及与CO和碳酸酯在 例如WO 91/11422,是不必要的。