问题：1-cyclopropyl-1,3-butanedione的合成方法
类型：求助 (悬赏分:3分)
提问：limz198305
等级：▲
版块：有机化学问题(jimuwei,fpcwin1211,netpanda,yjgzfl,Ftian,)
信誉：50%
回复：5
阅读：878
时间：2007-07-14 14:08:24 编辑加入/取消收藏订制/取消短消息举报该贴

有那位知道1-cyclopropyl-1,3-butanedione的合成方法及其理化性质。
合成方法要全文。

回复人：kewis,▲▲ () 时间：2007-07-14 14:53:24 编辑	1楼
wo2004024147

回复人：limz198305,▲ (化学世界是个很奇妙的领域.) 时间：2007-08-08 14:43:23 编辑	2楼
不全面，只有大概过程，没有性质。

回复人：afc,★★ (氟化学产品) 时间：2007-08-08 15:43:56 编辑

3楼

To a stirred solution of 8.4 g (0.1 mol) of cyclopropyl methyl ketone in 100 mL of ethyl acetate under nitrogen was added dropwise 39 mL (0.1 mol) of a 21 wt % solution of sodium ethoxide in absolute ethanol. The flask was fitted with a condenser and Dean-Stark trap and was heated. The ethanol was removed by azeotropic distillation. Additional ethyl acetate was added to the flask as needed. After three hours the temperature of the distillate had reached 75.degree. C. and the reaction was allowed to cool and stand overnight. The white solid which precipitated out was collected by filtration and the filtrate was set aside. The solid was dissolved in water and this solution was acidified at 0.degree. C. with 10% aqueous hydrochloric acid. This solution was extracted three times with ethyl ether. The ethyl acetate filtrate was washed with water three times, acidified with 10% aqueous hydrochloric acid, and extracted with ethyl ether. The ether extracts from both extractions were combined, dried over magnesium sulfate, and filtered. Removal of solvents gave 3.5 g of 1-cyclopropyl-1,3-butanedione as an oil. Analysis by GC showed 75% purity. This intermediate was used without further purification.

回复人：david_zhan,★★ () 时间：2007-08-09 08:15:09 编辑	4楼
兄弟是在研究嘧菌环胺吧。我已发到你邮箱了。不过没有全文啊！

回复人：limz198305,▲ (化学世界是个很奇妙的领域.) 时间：2007-08-09 13:21:51 编辑	5楼
75%的含量太低，我已经做到了，是否还有其它工艺路线，或者有提纯方法？

问题讨论没有结束...

您尚未进入本论坛,登录之后才可以回贴

5msec