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A Convenient and Safer Synthesis of Diaminoglyoxime
Organic Process Research & Development ( IF 3.1 ) Pub Date : 2017-11-29 00:00:00 , DOI: 10.1021/acs.oprd.7b00329
Eric C. Johnson 1 , Jesse J. Sabatini 1 , Nathaniel B. Zuckerman 2
Affiliation  

A new procedure for the synthesis and isolation of diaminoglyoxime (DAG) is described. A previous procedure involved treating glyoxal with 2 equiv each of hydroxylammonium chloride and sodium hydroxide to form glyoxime, followed by further treatment of this intermediate with two additional equivalents of hydroxylammonium chloride and sodium hydroxide at 95 °C to form DAG. Two recrystallizations were needed to obtain the desired product in pure form. Another previous procedure employed glyoxal in the presence of 4 equiv each of hydroxylammonium chloride and sodium hydroxide at 95 °C to form DAG. Though this latter procedure gives product after a few hours, yields do not exceed 40%, and the reaction is prone to thermal runaway. Furthermore, the use of decolorizing carbon and recrystallization of the crude solid are necessary to obtain a pure product. The new disclosed procedure involves treating a preheated aqueous hydroxylamine solution (50 wt %, 10 equiv) with aqueous glyoxal (40 wt %), followed by heating at 95 °C for 72–96 h. The reaction is cooled to room temperature and then to 0–5 °C to obtain DAG in pure form, without recrystallization or decolorizing carbon in 77–80% yield. The exothermic nature of the reaction is also minimized by this updated process.

中文翻译:

一种方便,安全的二氨基乙二肟合成方法

描述了一种合成和分离二氨基乙二肟(DAG)的新程序。先前的程序包括用2个当量的氯化铵和氢氧化钠分别处理乙二醛以形成乙二肟,然后在95°C下用另外两个当量的氯化铵和氢氧化钠对该中间体进行进一步处理以形成DAG。需要两次重结晶以获得纯净形式的所需产物。另一种先前的方法是在95℃下,在4当量的羟基氯化铵和氢氧化钠的存在下,使用乙二醛形成DAG。尽管该后一步骤在数小时后得到产物,但收率不超过40%,反应容易发生热失控。此外,必须使用脱色碳和粗固体的重结晶以获得纯净的产物。新公开的程序包括用乙二醛水溶液(40 wt%)处理预热的羟胺水溶液(50 wt%,10当量),然后在95°C加热72–96 h。将反应冷却至室温,然后冷却至0-5°C,以获得纯净形式的DAG,而无需重结晶或使碳脱色,产率为77-80%。通过该更新的方法,反应的放热性质也被最小化。
更新日期:2017-11-29
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