WO2010000197A1 - 一种5-氰基亚氨基芪的制备方法 - Google Patents
一种5-氰基亚氨基芪的制备方法 Download PDFInfo
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- WO2010000197A1 WO2010000197A1 PCT/CN2009/072528 CN2009072528W WO2010000197A1 WO 2010000197 A1 WO2010000197 A1 WO 2010000197A1 CN 2009072528 W CN2009072528 W CN 2009072528W WO 2010000197 A1 WO2010000197 A1 WO 2010000197A1
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- carbamazepine
- organic solvent
- trichloromethyl
- bis
- carbonate
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D223/00—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom
- C07D223/14—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
- C07D223/18—Dibenzazepines; Hydrogenated dibenzazepines
- C07D223/22—Dibenz [b, f] azepines; Hydrogenated dibenz [b, f] azepines
- C07D223/24—Dibenz [b, f] azepines; Hydrogenated dibenz [b, f] azepines with hydrocarbon radicals, substituted by nitrogen atoms, attached to the ring nitrogen atom
- C07D223/26—Dibenz [b, f] azepines; Hydrogenated dibenz [b, f] azepines with hydrocarbon radicals, substituted by nitrogen atoms, attached to the ring nitrogen atom having a double bond between positions 10 and 11
Definitions
- the present invention relates to a process for the preparation of 5-cyanoiminoguanidine.
- 5-cyanoiminoguanidine is an important intermediate of the new antiepileptic drug oxcarbazepine.
- WO2008012837 discloses two processes for preparing 5-cyanoiminoguanidine, one is based on iminoguanidine and reacted with a cyanating agent (BiCN) to obtain 5-cyanoiminoguanidine; one is carbamazepine; As a raw material, it is reacted with a dehydrating reagent (P 2 O 5 or P0C1 3 or S0C1 2 ) to give 5-cyanoiminoguanidine.
- a dehydrating reagent P 2 O 5 or P0C1 3 or S0C1 2
- the technical problem to be solved by the present invention is to provide a preparation method of 5-cyanoiminoguanidine which is simple and reasonable in process, high in product yield, free from pollution of three wastes, and environmentally friendly.
- a method for preparing 5-cyanoiminoguanidine represented by the formula (I), which is represented by the formula ( ⁇ ) Carbamazepine and bis(trichloromethyl) carbonate represented by formula (in) are used as raw materials, and reacted in an organic solvent at 20 to 150 ° C for 1 to 30 hours, and the reaction solution is post-treated to obtain 5-cyanorea.
- the reaction equation is as follows:
- the organic solvent of the present invention is selected from the group consisting of benzene, toluene, xylene, chlorobenzene, methylene chloride, trichloromethane, carbon tetrachloride, dichloroacetic acid, tetrahydrofuran, ethyl acetate, acetone, ⁇ ⁇ ⁇ .
- Preference is given to one of the following: toluene, xylene, dichloromethane, trichloromethane, tetrahydrofuran, ethyl acetate, acetone.
- the amount of the reactant charge material of the present invention is more than carbamazepine: bis(trichloromethyl) carbonate is generally 1.0: 0.2-1.2, preferably 1.0: 0.3-0.8.
- carbamazepine was added directly to the reactor containing the organic solvent.
- the bis(trichloromethyl)carbonate may be directly added to the reaction system, or the bis(trichloromethyl)carbonate may be first dissolved in an organic solvent and added to the reaction system as a liquid. The latter is generally recommended to better control the rate of addition of bis(trichloromethyl) carbonate.
- the mass of the organic solvent is preferably 5 to 20 times, preferably 5 to 10 times the mass of the carbamazepine.
- reaction temperature is preferably 20 to 80 ° C
- reaction time is preferably 4 to 15 hours.
- the post-treatment of the present invention can be carried out as follows: The reaction liquid is washed with water, the organic phase and the aqueous phase are separated, the organic phase is added to anhydrous sodium sulfate, and the solvent is distilled off under reduced pressure. The residue obtained was recrystallized from isopropanol to give 5-cyanoiminoindole (1).
- the preparation method specifically recommended is as follows: Adding an organic solvent and carbamazepine (II) to the reaction vessel, and slowly adding bis(trichloromethyl) dissolved in the same organic solvent at room temperature under vigorous stirring. a solution of carbonate ( ⁇ ), the amount of the reactant charged material is carbamazepine: bis(trichloromethyl) carbonate is 1.0: 0.3-0.8, and the total amount of the organic solvent is 5 ⁇ of carbamazepine mass 10 times, after the completion of the dropwise addition, the temperature is controlled at 20 to 80 ° C for 4 to 15 hours.
- the reaction solution is washed twice with water, the organic phase and the aqueous phase are separated, and the organic phase is dried over anhydrous sodium sulfate and then decompressed.
- the solvent is distilled off, and the obtained residue is recrystallized from isopropanol to give 5-cyanoiminoindole (1).
- the organic solvent is toluene, xylene, dichloromethane, trichloromethane, tetrahydrofuran, acetic acid Ester or acetone.
- the process uses bis(trichloromethyl)carbonate instead of P 2 0 5 or P0C1 3 or S0C1 2 as a dehydrating reagent to prepare 5-cyanoiminoguanidine, which greatly reduces safety and environmental hazards from the source, and the process is simple and reasonable.
- the product has high yield and is suitable for industrial production.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1: 0.2 (molar ratio), toluene is an organic solvent, and the reaction temperature is toluene reflux temperature.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1:0.3 (molar ratio), toluene is an organic solvent, and the reaction temperature is toluene reflux temperature.
- Example 3 The other operation was the same as in Example 1, to give 5-cyanoiminoguanidine, the purity was 96%, and the yield was 80%.
- Example 3 The other operation was the same as in Example 1, to give 5-cyanoiminoguanidine, the purity was 96%, and the yield was 80%.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1 : 0.4 (molar ratio), toluene is an organic solvent, and the reaction temperature is toluene reflux temperature.
- Example 4 The other operation was the same as in Example 1, to give 5-cyanoiminoguanidine, the purity was 98.5%, and the yield was 96%.
- Example 4 The other operation was the same as in Example 1, to give 5-cyanoiminoguanidine, the purity was 98.5%, and the yield was 96%.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1:0.5 (molar ratio), toluene is an organic solvent, and the reaction temperature is toluene reflux temperature.
- the other operation was the same as in Example 1, to give 5-cyanoiminoguanidine, the purity was 97%, and the yield was 95.7%.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1: 0.6 (molar ratio), toluene is an organic solvent, and the reaction temperature is toluene reflux temperature.
- Example 6 The other operation was the same as in Example 1, to give 5-cyanoiminoguanidine, purity 96%, yield 95.8%.
- Example 6 The other operation was the same as in Example 1, to give 5-cyanoiminoguanidine, purity 96%, yield 95.8%.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1: 0.9 (molar ratio), toluene is an organic solvent, and the reaction temperature is toluene reflux temperature.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1 : 1 (molar ratio), toluene is an organic solvent, and the reaction temperature is toluene reflux temperature.
- Example 8 The other operation was the same as in Example 1, to give 5-cyanoiminoguanidine, the purity was 92%, and the yield was 95.6%.
- Example 8 The feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1: 1.2 (molar ratio), toluene is an organic solvent, and the reaction temperature is toluene reflux temperature.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1 : 0.4 (molar ratio), toluene is an organic solvent, and the reaction temperature is 20 °C.
- the feed ratio is carbamazepine: bis(trichloromethyl)carbonate is 1:0.4 (molar ratio), toluene is an organic solvent, and the reaction temperature is 40 °C.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1 : 0.4 (molar ratio), toluene is an organic solvent, and the reaction temperature is 60 °C.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1 : 0.4 (molar ratio), toluene is an organic solvent, and the reaction temperature is 90 °C.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1 : 0.4 (molar ratio), chloroform is an organic solvent, and the reaction temperature is chloroform reflux temperature.
- the feed ratio is carbamazepine: bis(trichloromethyl) carbonate is 1: 0.4 (molar ratio), acetone is an organic solvent, and the reaction temperature is acetone reflux temperature.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Other In-Based Heterocyclic Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Hydrogenated Pyridines (AREA)
Description
说 明 书 一种 5-氰基亚氨基芪的制备方法
(一) 技术领域
本发明涉及一种 5-氰基亚氨基芪的制备方法。
(二) 背景技术
5-氰基亚氨基芪是新型抗癫痫药奥卡西平的重要中间体。
WO2008012837公开了两种制备 5-氰基亚氨基芪的方法, 一种 是以亚氨基芪为原料, 和氰化试剂 (BiCN) 反应得到 5-氰基亚氨基 芪; 一种是以卡马西平为原料, 和脱水试剂 (P205或 P0C13或 S0C12) 反应得到 5-氰基亚氨基芪。
以上专利的两种方法, 一种采用剧毒氰化试剂, 一种采用磷化 物或硫化物作脱水试剂, 安全隐患大, 三废治理困难, 均不符合绿 色化学技术的要求。
(三) 发明内容
本发明要解决的技术问题是提供一种工艺简单合理、产物收率较 高、 无三废污染、 绿色环保的 5-氰基亚氨基芪的制备方法。
为解决上述技术问题, 本发明采用的技术方案如下:
一种式 (I)所示的 5-氰基亚氨基芪的制备方法, 是以式 (Π)所示的
卡马西平与式 (in)所示的双 (三氯甲基) 碳酸酯为原料, 在有机溶 剂中于 20~150°C反应 1~30小时, 反应液经后处理得到 5-氰基亚氨 基芪 (1)。 反应方程式如下:
π m I
本发明所述有机溶剂选自下列之一: 苯、甲苯、二甲苯、氯苯、二 氯甲垸、三氯甲垸、四氯化碳、二氯乙垸、四氢呋喃、乙酸乙酯、丙酮、环 己垸。优选为下列之一: 甲苯、二甲苯、二氯甲垸、三氯甲垸、四氢呋喃、 乙酸乙酯、 丙酮。
本发明所述反应物投料物质的量比卡马西平: 双 (三氯甲基) 碳酸酯一般在 1.0: 0.2-1.2, 优选 1.0: 0.3~0.8。制备过程中, 卡马西 平直接加入装有有机溶剂的反应器中。双 (三氯甲基) 碳酸酯可以直 接加入到反应体系中, 也可以先将双 (三氯甲基) 碳酸酯用有机溶 剂溶解, 以液体的形式加入反应体系。一般推荐后者, 以便于更好地 控制加入双 (三氯甲基) 碳酸酯的速度。
所述有机溶剂的质量用量推荐为卡马西平质量的 5~20倍, 优选 5~10倍。
进一步, 所述反应温度优选为 20~80°C, 反应时间优选为 4~15 小时。
本发明所述的后处理可采取如下步骤: 反应液加水洗, 分离有 机相和水相, 取有机相加入无水硫酸钠干燥后减压蒸馏回收溶剂,
所得剩余物用异丙醇重结晶得到 5-氰基亚氨基芪 (1)。
具体推荐所述的制备方法按照如下步骤进行: 在反应容器中加 入有机溶剂和卡马西平 (II), 在室温、 剧烈搅拌下慢慢滴加用同一有 机溶剂溶解的双 (三氯甲基) 碳酸酯 (ΠΙ)的溶液, 所述反应物投料 物质的量比卡马西平: 双 (三氯甲基) 碳酸酯为 1.0: 0.3-0.8, 有机 溶剂的总用量为卡马西平质量的 5~10倍, 滴加完毕后控制温度在 20~80°C反应 4~15小时, 反应完毕后, 反应液加水洗两遍, 分离有 机相和水相, 有机相加入无水硫酸钠干燥后减压蒸馏回收溶剂, 所 得剩余物用异丙醇重结晶得到 5-氰基亚氨基芪 (1), 所述的有机溶剂 是甲苯、二甲苯、二氯甲垸、三氯甲垸、四氢呋喃、 乙酸乙酯或丙酮。
本发明与现有技术相比, 主要优点体现在:
该工艺用双 (三氯甲基) 碳酸酯替代 P205或 P0C13或 S0C12作 为脱水试剂制备 5-氰基亚氨基芪, 从源头上大大降低了安全和环保 隐患, 同时工艺简单合理、 产物收率较高, 适于工业化生产。
(四) 具体实施方式
以下以具体实例来说明本发明的技术方案, 但本发明的保护范 围不限于此:
实施例 1
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.2 (摩尔比) , 甲苯为有机溶剂, 反应温度为甲苯回流温度。
在装有机械搅拌、恒压滴液漏斗、回流冷凝管和温度计的 500 mL
四口烧瓶中, 加入 23.60 g卡马西平和 100 mL甲苯, 开启搅拌, 在 室温、剧烈搅拌下慢慢滴加 5.94 g溶于 50 mL甲苯的双 (三氯甲基) 碳酸酯溶液, 滴加完毕, 升温至回流, 保持 5小时后, 静置冷却, 加 100 mL水洗两遍, 分离有机相和水相, 有机相加入无水硫酸钠干 燥后减压蒸馏回收甲苯, 所得剩余物用异丙醇重结晶得到 5-氰基亚 氨基芪, 纯度 91%, 收率 38.7%。 实施例 2
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.3 (摩尔比) , 甲苯为有机溶剂, 反应温度为甲苯回流温度。
其它操作同实施例 1, 得 5-氰基亚氨基芪, 纯度 96% , 收率 80%。 实施例 3
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.4 (摩尔比) , 甲苯为有机溶剂, 反应温度为甲苯回流温度。
其它操作同实施例 1, 得 5-氰基亚氨基芪, 纯度 98.5% , 收率 96%。 实施例 4
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.5 (摩尔比) , 甲苯为有机溶剂, 反应温度为甲苯回流温度。
其它操作同实施例 1, 得 5-氰基亚氨基芪, 纯度 97% , 收率 95.7%。 实施例 5
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.6 (摩尔比) , 甲苯为有机溶剂, 反应温度为甲苯回流温度。
其它操作同实施例 1, 得 5-氰基亚氨基芪, 纯度 96% , 收率 95.8%。 实施例 6
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.9 (摩尔比) , 甲苯为有机溶剂, 反应温度为甲苯回流温度。
其它操作同实施例 1, 得 5-氰基亚氨基芪, 纯度 92% , 收率 95.8%。 实施例 7
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 1 (摩尔比) , 甲苯为有机溶剂, 反应温度为甲苯回流温度。
其它操作同实施例 1, 得 5-氰基亚氨基芪, 纯度 92% , 收率 95.6%。 实施例 8
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 1.2 (摩尔比) , 甲苯为有机溶剂, 反应温度为甲苯回流温度。
其它操作同实施例 1, 得 5-氰基亚氨基芪, 纯度 90% , 收率 94.8% 实施例 9
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.4 (摩尔比) , 甲苯为有机溶剂, 反应温度为 20°C。
在装有机械搅拌、恒压滴液漏斗、回流冷凝管和温度计的 500 mL 四口烧瓶中, 加入 23.60 g卡马西平和 100 mL甲苯, 开启搅拌, 在 室温、剧烈搅拌下慢慢滴加 11.88 g溶于 100 mL甲苯的双 (三氯甲基) 碳酸酯溶液, 滴加完毕, 20°C下保持 24小时后, 静置, 力口 lOO mL 水洗两遍, 分离有机相和水相, 有机相加入无水硫酸钠干燥后减压 蒸馏回收甲苯, 所得剩余物用异丙醇重结晶得到 5-氰基亚氨基芪, 纯度 82%, 收率 63%。 实施例 10
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.4 (摩尔比) , 甲苯为有机溶剂, 反应温度为 40°C。
在装有机械搅拌、恒压滴液漏斗、回流冷凝管和温度计的 500 mL 四口烧瓶中, 加入 23.60 g卡马西平和 100 mL甲苯, 开启搅拌, 在 室温、剧烈搅拌下慢慢滴加 11.88 g溶于 100 mL甲苯的双 (三氯甲基)
碳酸酯溶液, 滴加完毕, 40°C下保持 15小时后, 静置, 力口 lOO mL 水洗两遍, 分离有机相和水相, 有机相加入无水硫酸钠干燥后减压 蒸馏回收甲苯, 所得剩余物用异丙醇重结晶得到 5-氰基亚氨基芪, 纯度 87%, 收率 78%。 实施例 11
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.4 (摩尔比) , 甲苯为有机溶剂, 反应温度为 60°C。
在装有机械搅拌、 恒压滴液漏斗、 回流冷凝管和温度计的 500 mL四口烧瓶中, 加入 23.60 g卡马西平和 100 mL甲苯, 开启搅拌, 在室温、剧烈搅拌下慢慢滴加 11.88 g溶于 100 mL甲苯的双 (三氯甲 基) 碳酸酯溶液, 滴加完毕, 60°C下保持 11小时后, 静置, 加 100 mL水洗两遍, 分离有机相和水相, 有机相加入无水硫酸钠干燥后减 压蒸馏回收甲苯, 所得剩余物用异丙醇重结晶得到 5-氰基亚氨基芪, 纯度 93%, 收率 86%。 实施例 12
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.4 (摩尔比) , 甲苯为有机溶剂, 反应温度为 90°C。
在装有机械搅拌、恒压滴液漏斗、回流冷凝管和温度计的 500 mL 四口烧瓶中, 加入 23.60 g卡马西平和 100 mL甲苯, 开启搅拌, 在 室温、剧烈搅拌下慢慢滴加 11.88 g溶于 100 mL甲苯的双 (三氯甲基)
碳酸酯溶液, 滴加完毕, 90°C下保持 8小时后, 静置, 力口 lOO mL水 洗两遍, 分离有机相和水相, 有机相加入无水硫酸钠干燥后减压蒸 馏回收甲苯, 所得剩余物用异丙醇重结晶得到 5-氰基亚氨基芪, 纯 度 97%, 收率 90%。 实施例 13
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.4 (摩尔比) , 氯仿为有机溶剂, 反应温度为氯仿回流温度。
在装有机械搅拌、恒压滴液漏斗、回流冷凝管和温度计的 500 mL 四口烧瓶中, 加入 23.60 g卡马西平和 100 mL氯仿, 开启搅拌, 在 室温、剧烈搅拌下慢慢滴加 11.88 g溶于 100 mL氯仿的双 (三氯甲基) 碳酸酯溶液, 滴加完毕, 升温至回流保持 6小时后, 静置冷却, 加 100 mL水洗两遍, 分离有机相和水相, 有机相加入无水硫酸钠干燥 后减压蒸馏回收甲苯, 所得剩余物用异丙醇重结晶得到 5-氰基亚氨 基芪, 纯度 98%, 收率 97%。 实施例 14
投料比卡马西平: 双 (三氯甲基) 碳酸酯为 1 : 0.4 (摩尔比) , 丙酮为有机溶剂, 反应温度为丙酮回流温度。
在装有机械搅拌、恒压滴液漏斗、回流冷凝管和温度计的 500 mL 四口烧瓶中, 加入 23.60 g卡马西平和 100 mL丙酮, 开启搅拌, 在 室温、剧烈搅拌下慢慢滴加 11.88 g溶于 100 mL丙酮的双 (三氯甲基)
碳酸酯溶液, 滴加完毕, 升温至回流保持 9小时后, 静置, 加 100 mL水洗两遍, 分离有机相和水相, 有机相加入无水硫酸钠干燥后减 压蒸馏回收甲苯, 所得剩余物用异丙醇重结晶得到 5-氰基亚氨基芪, 纯度 90%, 收率 84%。
Claims
2、 如权利要求 1所述的制备方法, 其特征在于所述有机溶剂选自下 列之一: 苯、甲苯、二甲苯、氯苯、二氯甲垸、三氯甲垸、四氯化碳、二氯 乙垸、 四氢呋喃、 乙酸乙酯、 丙酮、 环己垸。
3、 如权利要求 2所述的制备方法, 其特征在于所述有机溶剂选自下 列之一: 甲苯、二甲苯、二氯甲垸、三氯甲垸、四氢呋喃、乙酸乙酯、丙 酮。
4、 如权利要求 1所述的制备方法, 其特征在于所述反应物投料物质 的量比卡马西平: 双 (三氯甲基) 碳酸酯为 1.0: 0.2~1.2。
5、 如权利要求 4所述的制备方法, 其特征在于所述反应物投料物质 的量比卡马西平: 双 (三氯甲基) 碳酸酯为 1.0: 0.3~0.8。
6、 如权利要求 2所述的制备方法, 其特征在于所述有机溶剂的质量 用量为卡马西平质量的 5~20倍。
7、 如权利要求 6所述的制备方法, 其特征在于所述有机溶剂的质量
用量为卡马西平质量的 5~10倍。
8、 如权利要求 1所述的制备方法, 其特征在于所述反应温度为 20~80°C, 反应时间为 4~15小时。
9、 如权利要求 1~8之一所述的制备方法, 其特征在于所述后处理为: 反应液加水洗, 分离有机相和水相, 取有机相加入无水硫酸钠干燥 后减压蒸馏回收溶剂, 所得剩余物用异丙醇重结晶得到 5-氰基亚氨 基芪 (1)。
10、如权利要求 1所述的制备方法, 其特征在于所述的方法按照如下 步骤进行: 在反应容器中加入有机溶剂和卡马西平 (Π), 在室温、 剧 烈搅拌下慢慢滴加用同一有机溶剂溶解的双 (三氯甲基) 碳酸酯 (ΠΙ)的溶液, 所述反应物投料物质的量比卡马西平: 双 (三氯甲基 碳酸酯为 1.0 : 0.3-0.8 , 有机溶剂的总质量用量为卡马西平质量的 5~10倍, 滴加完毕后控制温度在 20~80°C反应 4~15小时, 反应完毕 后, 反应液加水洗两遍, 分离有机相和水相, 有机相加入无水硫酸 钠干燥后减压蒸馏回收溶剂, 所得剩余物用异丙醇重结晶得到 5-氰 基亚氨基芪 (1), 所述的有机溶剂是甲苯、二甲苯、二氯甲浣、三氯甲浣、 四氢呋喃、 乙酸乙酯或丙酮。
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CN101328146A (zh) * | 2008-07-04 | 2008-12-24 | 浙江工业大学 | 一种5-氰基亚氨基芪的制备方法 |
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CN116022748A (zh) * | 2022-12-16 | 2023-04-28 | 山东惟普新能源有限公司 | 一种含水双氟磺酰亚胺锂的除水方法 |
CN116022748B (zh) * | 2022-12-16 | 2024-02-27 | 山东惟普新能源有限公司 | 一种含水双氟磺酰亚胺锂的除水方法 |
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EP2311813A4 (en) | 2012-06-06 |
CN101328146B (zh) | 2011-07-27 |
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