CN1249298A - 3-甲氧基-4-羟基苯甲醛的改良制备方法 - Google Patents

3-甲氧基-4-羟基苯甲醛的改良制备方法 Download PDF

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CN1249298A
CN1249298A CN 98121912 CN98121912A CN1249298A CN 1249298 A CN1249298 A CN 1249298A CN 98121912 CN98121912 CN 98121912 CN 98121912 A CN98121912 A CN 98121912A CN 1249298 A CN1249298 A CN 1249298A
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methoxyl group
described preparation
hydroxy
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胡慷
胡曰珍
胡曰琮
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    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/61Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
    • C07C45/67Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
    • C07C45/68Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
    • C07C45/70Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction with functional groups containing oxygen only in singly bound form
    • C07C45/71Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction with functional groups containing oxygen only in singly bound form being hydroxy groups
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/61Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
    • C07C45/63Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by introduction of halogen; by substitution of halogen atoms by other halogen atoms

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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Abstract

本发明涉及一种香料3-甲氧基-4-羟基苯甲醛的改良制备方法。以对甲苯酚为起始原料,通过在由醇钠溶液存在下加入适量的钴盐催化剂,并通入氧气进行醛化反应得到55~75%的目的物,未反应物经过酸化后回收。这样就杜绝邻位产物的生成,与原有工艺路线相比较,使目的物收率大大提高。由于对甲苯酚作为起始原料,无须使用对亚硝基二甲基苯胺作为载体试剂,避免了有毒物质的使用,并大大地降低了三废的排放量。

Description

3-甲氧基-4-羟基苯甲醛的改良制备方法。
本发明属于一种改良的3-甲氧基-4-羟基苯甲醛的制备方法。
随着人们生活水平的不断提高,对食用香料的需求量快速增长,3-甲氧基-4羟基苯甲醛是一种重要的食用香料大量用于食品香精的调配。
它的制备方法,通常由邻甲氧基苯酚与乌洛托品在有对亚硝基二甲基苯胺存在下加入少量催化剂,经由缩合反应产生目的物,再通过萃取,蒸馏,结晶等提纯手段而制得,(化工产品手册——日用化工产品338页—北京日用化学工业学会,1989年5月)。
该方法由于反应液中目的物的含量仅在15%左右,故三废排放量大,后果严重。
同时在反应过程中由于受到邻、对位定位效应的制约,使缩合反应中产生了大量没有香味无法利用的邻位产物,为后续提纯工段带来了分离困难,大大地影响了目的物的产率。
所以,寻找一种高产率,减少三废排放的3-甲氧基-4羟基苯甲醛的改良制备方法,仍是人们渴望解决的课题。
本发明的目的,是提供一种改良的3-甲氧基-4-羟基苯甲醛的制备方法。
利用对甲苯酚为起始原料,能定量定位在对位上醛基,消除了2-羟基-3-甲氧基苯甲醛的生成,达到提高目的物的产率。
同时由于割除了对亚硝基二甲基苯胺的使用,从而大大减少了废液的排放和有害物质的产生。
本发明所提供的制备方法,是由对甲苯酚为起始原料,在甲醇钠的溶液中,加入适当量的催化剂,进行气相氧化反应,得到对羟基苯甲醛,由此得率一般在55~75%之间,未反应物尚有一部分可以回收重复使用。
本发明方法,可以采用≥95%左右含量的对甲苯酚,不需高纯度的对甲苯酚,这就为在煤焦油化工中的混合甲酚提供了大量使用的机会。
本发明的方法中,对通入氧气的计量和控制,可采用薄层层析法。对反应液中转化产物进行跟踪,并确定其反应终止期。
本发明的方法,所指对羟基苯甲醛的邻位上甲氧基基团的方法,是通过单溴化,然后再进行甲氧基化反应,以制备3-甲氧基-4-羟基苯甲醛。
通过本发明的方法制备3-甲氧基-4-羟基苯甲醛时其优点及创新处为:工艺反应时间缩短,产品生产成本较原先对亚硝基二甲基苯胺法降低10~15%,反应时间缩短,三废大大减少近80%。
通过下述实施例将有助于进一步理解本发明,但并不限制本发明的内容。
实施例:
在装有电动搅拌,回流冷凝管及温度计的500毫升三颈瓶中加入对甲苯酚54克(0.5Mol纯度≥95%)氢氧化钠80克(2Mol)甲醇150毫升适量钴盐催化剂于40~100℃通入氧气反应8~14小时后蒸除溶剂,经萃取重结晶得淡黄色晶体对羟基苯甲醛35~50克,收率55~75%,溶点116~117℃。

Claims (4)

1、一种由对甲苯酚为起始原料,在醇钠溶液中有适量钴盐催化剂存在下制备对羟基苯甲醛再经溴化,甲氧基化制备香料3-甲氧基-4-羟基苯甲醛的改良方法,消除了邻位醛基产物的生成。
2、一种如权利要求1项所述的制备3-甲氧基-4-羟基苯甲醛的改良方法,改变了原来由邻甲氧基苯酚为起始原料,采用对亚硝基二甲基苯胺法二氧化氮的排放及甲醛溶液的生成。
3、一种如权利要求1项、2项所述的制备3-甲氧基-4-羟基苯甲醛的改良方法,改变了反应使用介质免除了有毒废液的排放。
4、一种如权利要求1项、2项、3项所述的制备3-甲氧基-4-羟基苯甲醛的改良方法,改变了精制方法使精制工艺大为简化。
CN 98121912 1998-09-28 1998-09-28 3-甲氧基-4-羟基苯甲醛的改良制备方法 Pending CN1249298A (zh)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101870642A (zh) * 2009-04-21 2010-10-27 赢创德固赛有限责任公司 制备取代的1,4-醌甲基化物的方法
CN101258119B (zh) * 2005-07-25 2014-06-18 恩多拉公司 制备3,4-二氧代-经取代芳香族醛的方法
CN109665948A (zh) * 2019-01-09 2019-04-23 沈阳化工大学 一种以邻苯二酚为原料制备邻位香兰素的方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101258119B (zh) * 2005-07-25 2014-06-18 恩多拉公司 制备3,4-二氧代-经取代芳香族醛的方法
CN101870642A (zh) * 2009-04-21 2010-10-27 赢创德固赛有限责任公司 制备取代的1,4-醌甲基化物的方法
CN101870642B (zh) * 2009-04-21 2015-07-29 赢创德固赛有限责任公司 制备取代的1,4-醌甲基化物的方法
CN109665948A (zh) * 2019-01-09 2019-04-23 沈阳化工大学 一种以邻苯二酚为原料制备邻位香兰素的方法

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