申请人:KAWASAKI STEEL CORPORATION
公开号:EP0338088A1
公开(公告)日:1989-10-25
p-Hydroxybenzoic acid can be prepared by reacting an alkali metal salt of pheno (excluding lithium and sodium salts) with carbon dioxide in the presence of at least one compound represented by general formulae (I) or (II) wherein, M represents an alkali metal other than lithium and sodium. In formula (I) R represents a substituent other than an aliphatic hydroxy group containing up to 4 carbon atoms, an aliphatic mercapto group containing up to 4 carbon atoms, a substituent containing at least one of these as a structural unit, and a hydrogen atom. In formula (II) R′ represents a substituent other than an aliphatic hydroxy group containing up to 4 carbon atoms, an aliphatic mercapto group containing up to 4 carbon atoms, and a substituent containing at least one of these as a structural unit. In formula (I) n represents an integer of 1 to 5 and the R groups may be the same or different when n is 2 or more. In formula (II) m represents an integer of 1 to 5 and 1 represents an integer of 0 to 4 provided that the M atoms may be the same or different when m is 1 or more and the R groups may be the same or different when 1 is 2 or more. The above-described reaction may be conducted using or not using an inert reaction medium.
ABSTRACT
Para-hydroxybenzoic acid is prepared by reacting an alkali metal salt of phenol except the lithium and sodium salts with carbon dioxide in the presence of at least one compound selected from compounds of the following formulae (I) and (II):
In formulae (I) and (II), M is an alkali metal except lithium and sodium; R is any substituent except an aliphatic hydroxy group having up to 4 carbon atoms, an aliphatic mercapto group having up to 4 carbon atoms, a substituent having at least one of them as its structural unit, and a hydrogen atom; R′ is any substituent except an aliphatic hydroxy group having up to 4 carbon atoms, an aliphatic mercapto group having up to 4 carbon atoms, and a substituent having at least one of them as its structural unit; in formula (I) n is an integer of 1 to 5, and R groups may be the same or different when n is more than one; in formula (II) m is an integer of 1 to 5 and ℓ is an integer of 0 to 4, and M alkali metals may be the same or different when m is one or more, and R′ groups may be the same or different when ℓ is more than one. The reaction may be carried out in the presence or absence of reaction medium.
对羟基苯甲酸的制备方法是将苯胺的碱金属盐(锂盐和钠盐除外)在至少一种通式 (I) 或 (II) 所代表的化合物存在下与二氧化碳反应,其中,M 代表锂和钠以外的碱金属。在式 (I) 中,R 代表取代基,但不包括含最多 4 个碳原子的脂肪族羟基、含最多 4 个碳原子的脂肪族巯基、作为结构单元至少含有其中一个的取代基和氢原子。在式(II)中,R′代表取代基,但不包括含最多 4 个碳原子的脂肪族羟基、含最多 4 个碳原子的脂肪族巯基和至少含有其中一个作为结构单元的取代基。在式 (I) 中,n 代表 1 至 5 的整数,当 n 为 2 或 2 以上时,R 基团可以相同或不同。在式(II)中,m 代表 1 至 5 的整数,1 代表 0 至 4 的整数,条件是当 m 为 1 或更多时,M 原子可以相同或不同,当 1 为 2 或更多时,R 基团可以相同或不同。上述反应可使用或不使用惰性反应介质。
摘要
对羟基苯甲酸是由苯酚的碱金属盐(锂盐和钠盐除外)与二氧化碳在至少一种选自下式(I)和(II)化合物的化合物存在下反应制备的:
在式(I)和(II)中,M 是碱金属,锂和钠除外;R 是任何取代基,具有最多 4 个碳原子的脂肪族羟基、具有最多 4 个碳原子的脂肪族巯基、至少具有其中一个作为其结构单元的取代基和氢原子除外;R′ 是任何取代基,但具有最多 4 个碳原子的脂肪族羟基、具有最多 4 个碳原子的脂肪族巯基和至少以其中一个作为结构单元的取代基除外;在式 (I) 中,n 为 1 至 5 的整数,当 n 多于一个时,R 基团可以相同或不同;在式 (II) 中,m 为 1 至 5 的整数,ℓ 为 0 至 4 的整数,当 m 为一个或多个时,M 碱金属可以相同或不同,当 ℓ 多于一个时,R′ 基团可以相同或不同。反应可在反应介质存在或不存在的情况下进行。