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    Processes for preparing hydroxynaphthalenes
    2.
    发明授权
    Processes for preparing hydroxynaphthalenes 失效
    制备羟基萘的方法

    公开(公告)号：US4783557A

    公开(公告)日：1988-11-08

    申请号：US94883

    申请日：1987-09-10

    申请人： Yutaka Haneda ,  Sadao Yoshimoto ,  Hisaya Miki ,  Masaaki Yasuda ,  Shintarou Araki ,  Masatoshi Nitabaru

    发明人： Yutaka Haneda ,  Sadao Yoshimoto ,  Hisaya Miki ,  Masaaki Yasuda ,  Shintarou Araki ,  Masatoshi Nitabaru

    IPC分类号： C07C37/055 ,  C07C37/08 ,  C07C39/14 ,  C07C67/055 ,  C07C409/08

    CPC分类号： C07C409/08 ,  C07C37/0555 ,  C07C37/08 ,  C07C407/00

    摘要： Disclosed in accordance with the present invention are processes for the preparation of hydroperoxides and/or carbinols by liquid phase oxidation of secondary alkyl-substituted naphthalenes with molecular oxygen, wherein the oxidation reaction is carried out by dissolving in the reaction mixture containing the secondary alkyl-substituted naphthalenes at least 0.5 ppm in terms of metal, based on the starting secondary alkyl-substituted naphthalenes, of at least one compound of metal selected from the group consisting of palladium and gold, said metal compound being soluble in the reaction mixture of the secondary alkyl-substituted naphthalenes. When compared with the prior art processes using catalysts of non-homogeneous system, therefore, not only the amount of catalyst used can be minimized but also the rate of oxidation can be enhanced, and hence there can be obtained in a short period of time hydroperoxides and/or carbinols in high yields which are the oxidation products in accordance with the present invention.According to the present invention, the desired hydroperoxide can be obtained in high yields as well as in high purity from the hydroperoxides and/or carbinols obtained in the manner as mentioned above.

    摘要翻译： 根据本发明公开的是通过用分子氧液体氧化仲烷基取代的萘来制备氢过氧化物和/或甲醇的方法，其中氧化反应是通过将含有仲烷基取代萘 取代的萘以至少一种选自钯和金的金属化合物为基础，以起始仲烷基取代的萘为基准的金属为至少0.5ppm，所述金属化合物可溶于二级反应混合物 烷基取代的萘。 因此，与使用非均相体系的催化剂的现有技术方法相比，不仅可以使催化剂的使用量最小化，还可以提高氧化速度，因此可以在短时间内获得氢过氧化物 和/或高产率的甲醇，它们是根据本发明的氧化产物。 根据本发明，可以从上述方式获得的氢过氧化物和/或甲醇以高产率和高纯度获得所需的氢过氧化物。

    Method of preparation of 4-hydroxy-1,2,2,6,6-pentamethylpiperidine
    5.
    发明授权
    Method of preparation of 4-hydroxy-1,2,2,6,6-pentamethylpiperidine 失效
    4-羟基-1,2,2,6,6-五甲基哌啶的制备方法

    公开(公告)号：US5910591A

    公开(公告)日：1999-06-08

    申请号：US953517

    申请日：1997-10-17

    申请人： Masaaki Yasuda

    发明人： Masaaki Yasuda

    IPC分类号： C07D211/46 ,  C07D211/44

    CPC分类号： C07D211/46

    摘要： The present invention relates to a method for preparing 4-hydroxy-1,2,2,6,6-pentamethylpiperidine comprising the following steps:(i) reacting 4-hydroxy-2,2,6,6-tetramethylpiperidine with at least one compound selected from the group consisting of formaldehyde, paraformaldehyde and trioxane, optionally in the presence of formic acid;(ii) neutralizing the reaction product of step (i) by adding a base thereto; and(iii) after the neutralization, separating the crude product from the aqueous layer and crystallizing and filtering the crude product to thereby obtain crystals of 4-hydroxy-1,2,2,6,6-pentamethylpiperidine with a water content of 3% by weight or less. The present invention also relates to a method for preparing 4-hydroxy-1,2,2,6,6-pentamethylpiperidine, comprising reacting 4-hydroxy-2,2,6,6-tetramethylpiperidine with at least one compound selected from the group consisting of formaldehyde, paraformaldehyde and trioxane, optionally in the presence of formic acid added in an amount smaller than that of 4-hydroxy-2,2,6,6-tetramethylpiperidine in terms of mole.

    摘要翻译： 本发明涉及一种制备4-羟基-1,2,2,6,6-五甲基哌啶的方法，包括以下步骤：（i）使4-羟基-2,2,6,6-四甲基哌啶与至少一种 选自甲醛，多聚甲醛和三恶烷的化合物，任选在甲酸存在下; （ii）通过向其中加入碱来中和步骤（i）的反应产物; 和（iii）中和后，将粗产物与水层分离并使粗产物结晶并过滤，从而得到水含量为3％的4-羟基-1,2,2,6,6-五甲基哌啶晶体， 以下。 本发明还涉及一种制备4-羟基-1,2,2,6,6-五甲基哌啶的方法，包括使4-羟基-2,2,6,6-四甲基哌啶与至少一种选自下组的化合物 由甲醛，多聚甲醛和三恶烷组成，任选在甲酸的存在下加入的量小于4-羟基-2,2,6,6-四甲基哌啶的摩尔量。