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wangbaowk

新虫 (初入文坛)

[求助] 关于二价钌配位物的制备 已有1人参与

大伙帮帮忙吧,我现在在做一个二价钌的催化剂,具体是双-(二甲基烯丙基)环辛-1,5-二烯钌,是1,5-环辛二烯二氯化钌和格氏试剂2-甲基烯丙基氯化镁制备得到的,我按照文献上的步骤,将两者反应的生成物,通过硅藻土,乙醚萃取,中性氧化铝过滤,蒸干等,最后也得到了文献所说的黑色残渣,文献上说加入甲醇会有固体析出,可是我做了很多次,第一次有固体析出,第二次也有,但是固体和第一次不同,还有几次是加入甲醇之后没有固体出来,等过一段时间才有稍许固体出来,请教一下这个是什么原理??文献还说用甲醇-石油醚重结晶,可是甲醇和石油醚并不互溶,怎么重结晶啊,英文原文在下面:
This material was prepared using minor modifications to a literature procedure [2]. 2-Methylallylmagnesium chloride was found to be poorly soluble in Et2O and
therefore THF was used as the solvent. The Grignardreagent (2 M, 6 ml, 12 mmol; prepared from Mg and 3-chloro-2-methylpropene in THF) was added to a
suspension of [RuCl2(cod)]x (0.28 g, 1.0 mmol Ru) in Et2O (10 ml):THF (15 ml) and the mixture stirred at 20°C for 10 min. The excess Grignard reagent was
precipitated from solution by adding Et2O and the suspension was filtered through Celite. The filtrate was hydrolyzed in ice-water and the mixture extracted with
Et2O(220 ml). The organic layer was dried over MgSO4, concentrated, filtered through a short column of neutral alumina (55 cm) and evaporated to dry-
ness. Reprecipitation from a mixture of MeOH and petroleum ether gave pure 1
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heyanj

银虫 (正式写手)

【答案】应助回帖

目测你甲醇加多了,加热蒸发一会甲醇就有沉淀析出了
专业就好
2楼2016-06-02 16:59:30
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