Chlorination of nitrophenols
    5.
    发明授权
    Chlorination of nitrophenols 失效
    硝基酚的氯化

    公开(公告)号:US4827047A

    公开(公告)日:1989-05-02

    申请号:US164894

    申请日:1988-03-07

    CPC分类号: C07C201/12

    摘要: The chloronitrophenols, e.g., 2,6-dichloro-4-nitrophenol (a known agrochemical/pharmaceutical intermediate), are efficiently prepared by chlorinating ortho- or para-nitrophenol with gaseous chlorine, characteristically in the molten state, and in the presence of a catalytically effective amount of a primary, secondary or tertiary amine.

    摘要翻译: 氯代苯酚,例如2,6-二氯-4-硝基苯酚(已知的农用化学品/药物中间体)通过用气态氯氯化邻苯二甲酸或对硝基苯酚而有效地制备,特征为熔融状态,并且在 催化有效量的伯,仲或叔胺。

    Method for preparing p-hydroxymandelic compounds optionally substituted
    6.
    发明授权
    Method for preparing p-hydroxymandelic compounds optionally substituted 失效
    制备任选取代的对羟基扁桃酸化合物的方法

    公开(公告)号:US06753441B1

    公开(公告)日:2004-06-22

    申请号:US09719839

    申请日:2001-03-14

    IPC分类号: C07C6976

    摘要: The invention concerns a method for preparing p-hydroxymandelic compounds optionally substituted and their derivatives. More particularly, it concerns a method for preparing p-hydroxymandelic acid and methoxy-3 p-hydroxymandelic acid and their derivatives. The invention concerns a method for preparing p-hydroxymandelic compounds optionally substituted and their derivatives, which consists in condensing in water, in the presence of an alkaline agent, an aromatic compound bearing at least a hydroxyl group and whereof the position in para is free, with glyoxylic acid, said method being characterised in that the reaction is carried out in the presence of an efficient amount of a compound bearing at least two carboxylic functions.

    摘要翻译: 本发明涉及一种制备任选取代的对羟基扁桃酸化合物及其衍生物的方法。 更具体地说,它涉及一种制备对羟基扁桃酸和甲氧基-3对羟基扁桃酸及其衍生物的方法。 本发明涉及一种制备任选取代的对羟基扁桃酸化合物及其衍生物的方法,该方法包括在水中,在碱性试剂存在下,至少含羟基的芳族化合物和其中的位置在其中位于其中, 所述方法的特征在于反应在有效量的具有至少两个羧酸官能团的化合物的存在下进行。

    Process for the preparation of a substituted 4-hydroxybenzaldehyde
    7.
    发明授权
    Process for the preparation of a substituted 4-hydroxybenzaldehyde 失效
    制备取代的4-羟基苯甲醛的方法

    公开(公告)号:US5756853A

    公开(公告)日:1998-05-26

    申请号:US722210

    申请日:1996-10-16

    摘要: The subject of the present invention is a process for the preparation of a 4-hydroxybenzaldehyde carrying at least one substituent in the position ortho to the OH group. It more particularly relates to the preparation of 3-methoxy-4-hydroxybenzaldehyde and of 3-ethoxy-4-hydroxybenzaldehyde. The process for the preparation of a substituted 4-hydroxybenzaldlehyde, substituted at least in the 3 position by an alkoxy group, is characterized in that it comprises subjecting a substituted phenol compound, substituted at least in the 2 position by an alkoxy group and in which the 4 and 6 positions are free, to a first stage of carboxylation in the 6 position, then to a stage of hydroxymethylation in the 4 position, followed by a stage of oxidation of the hydroxymethyl group to a formyl group, and finally to a last decarboxylation stage.

    摘要翻译: PCT No.PCT / FR96 / 00241 Sec。 371日期1996年10月16日第 102(e)日期1996年10月16日PCT提交1996年2月14日PCT公布。 WO96 / 26175 PCT出版物 日本1996年8月29日本发明的主题是在OH基的邻位含有至少一个取代基的4-羟基苯甲醛的制备方法。 更具体地涉及3-甲氧基-4-羟基苯甲醛和3-乙氧基-4-羟基苯甲醛的制备。 制备至少在3位被烷氧基取代的取代的4-羟基苯甲醛的方法的特征在于它包括使至少在2位被烷氧基取代的取代酚化合物,其中 4位和6位是自由的,到第6位的羧化的第一阶段,然后到4位的羟甲基化阶段,随后是羟甲基氧化成甲酰基的阶段,最后到最后 脱羧阶段。