苯乙腈乙酸乙脂甲醇钠反应二小时ph也调了也过滤了静止几小时,怎么还是一杯水什么物体也没有.哪里做了,在什么步骤后才结晶.
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:英语作业 时间:2024/07/11 09:54:40
苯乙腈乙酸乙脂甲醇钠反应二小时ph也调了也过滤了静止几小时,怎么还是一杯水什么物体也没有.哪里做了,在什么步骤后才结晶.
![苯乙腈乙酸乙脂甲醇钠反应二小时ph也调了也过滤了静止几小时,怎么还是一杯水什么物体也没有.哪里做了,在什么步骤后才结晶.](/uploads/image/z/18089191-55-1.jpg?t=%E8%8B%AF%E4%B9%99%E8%85%88%E4%B9%99%E9%85%B8%E4%B9%99%E8%84%82%E7%94%B2%E9%86%87%E9%92%A0%E5%8F%8D%E5%BA%94%E4%BA%8C%E5%B0%8F%E6%97%B6ph%E4%B9%9F%E8%B0%83%E4%BA%86%E4%B9%9F%E8%BF%87%E6%BB%A4%E4%BA%86%E9%9D%99%E6%AD%A2%E5%87%A0%E5%B0%8F%E6%97%B6%2C%E6%80%8E%E4%B9%88%E8%BF%98%E6%98%AF%E4%B8%80%E6%9D%AF%E6%B0%B4%E4%BB%80%E4%B9%88%E7%89%A9%E4%BD%93%E4%B9%9F%E6%B2%A1%E6%9C%89.%E5%93%AA%E9%87%8C%E5%81%9A%E4%BA%86%2C%E5%9C%A8%E4%BB%80%E4%B9%88%E6%AD%A5%E9%AA%A4%E5%90%8E%E6%89%8D%E7%BB%93%E6%99%B6.)
这个反应是需要加热的,而且醇钠的质量要保证.下边是一个专利的操作,不同之处是使用了现场制备的乙醇钠,
25 g (0.213 mol) portion of phenylacetonitrile and 33 ml of ethyl acetate were added to an ethanol solution of sodium ethoxide prepared from ethanol (150 ml) and 6.38 g (0.277 mol) of metallic sodium and then heated under reflux for 3 hours.After cooling,this was concentrated under a reduced pressure,and the thus obtained residue was mixed with water and dichloromethane to separate the organic layer.This was washed with 1 N hydrochloric acid and brine and dried over magnesium sulfate,and then the solvent was evaporated.The thus obtained residue was applied to a silica gel column chromatography to obtain 3.15 g (9percent) of the title compound as a colorless oily substance from a n-hexane-ethyl acetate (5:1-->3:1 v/v) eluate.MS (FAB)m/z:160 (M+1)+.1H-NMR (CDCl3)δ:2.27 (3H,s),4.68 (1H,s),7.36-7.52 (5H,m).
25 g (0.213 mol) portion of phenylacetonitrile and 33 ml of ethyl acetate were added to an ethanol solution of sodium ethoxide prepared from ethanol (150 ml) and 6.38 g (0.277 mol) of metallic sodium and then heated under reflux for 3 hours.After cooling,this was concentrated under a reduced pressure,and the thus obtained residue was mixed with water and dichloromethane to separate the organic layer.This was washed with 1 N hydrochloric acid and brine and dried over magnesium sulfate,and then the solvent was evaporated.The thus obtained residue was applied to a silica gel column chromatography to obtain 3.15 g (9percent) of the title compound as a colorless oily substance from a n-hexane-ethyl acetate (5:1-->3:1 v/v) eluate.MS (FAB)m/z:160 (M+1)+.1H-NMR (CDCl3)δ:2.27 (3H,s),4.68 (1H,s),7.36-7.52 (5H,m).
日光灯坏了开了开关后什么反应也没有,灯管两端也没有发亮,所以不是镇流器和启辉器的问题?(以前没坏的时候开灯也要过一阵子才
形容什么也没有了的词语
比喻什么也没有了的成语
在做阅读题时读完后完全不知道怎么答,看了答案后立刻就会了,可总是这样也不行.所以想问问大家在做阅读题是有没有什么好的方法
我怎么发现最近变笨了,反应很慢,做题思路也没有,什么影响的呢?怎么提高智力,
没有了你我的世界就什么也没有了,用英语怎么讲?
形容变得什么也没有了,不存在了的词语
向她写了一封情书,而她什么反应也没有,这说明什么
“做”了,他自己也没有“说”.这句话用了什么修辞手法?
(没有了.也就没有)怎么造句
什么也没有了指什么四字词语
如果宇宙消失了,世界上什么也没有了..那什么也没有了,那是怎样的