| 查看: 620 | 回复: 9 | ||
| 当前主题已经存档。 | ||
| 【悬赏金币】回答本帖问题,作者gaoru将赠送您 5 个金币 | ||
[求助]
简单的一段话!!!求牛人帮忙!!!
|
||
| The crude product from other batches was combined at this stage. Recrystallization from various solvents (cyclohexane, hexanes) were moderately successful, removing starting material (Rf = 0.85) in hexanes and mono-reacted material (Rf = 0.7). Flash chromatography used immediately after workup to prevent hydrolysis of the unstable product. After careful fractionation, the desired product was obtained as a white crystalline solid (Rf = 0.2 in hexanes) with yields ranging from 20-40%. Almost immediately above this spot on TLC is residual BPO which becomes discolored on silica plates, and was discarded. |
» 猜你喜欢
全日制(定向)博士
已经有5人回复
假如你的研究生提出不合理要求
已经有10人回复
萌生出自己或许不适合搞科研的想法,现在跑or等等看?
已经有4人回复
Materials Today Chemistry审稿周期
已经有4人回复
参与限项
已经有3人回复
实验室接单子
已经有4人回复
对氯苯硼酸纯化
已经有3人回复
求助:我三月中下旬出站,青基依托单位怎么办?
已经有12人回复
所感
已经有4人回复
要不要辞职读博?
已经有7人回复
2楼2008-10-31 12:46:46
3楼2008-10-31 13:55:41
xdc723
金虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 1520.8
- 散金: 24
- 红花: 3
- 帖子: 273
- 在线: 101小时
- 虫号: 419008
- 注册: 2007-07-04
- 性别: GG
- 专业: 头颈部及颌面肿瘤
4楼2008-10-31 17:15:32
xdc723
金虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 1520.8
- 散金: 24
- 红花: 3
- 帖子: 273
- 在线: 101小时
- 虫号: 419008
- 注册: 2007-07-04
- 性别: GG
- 专业: 头颈部及颌面肿瘤
5楼2008-10-31 17:19:39
6楼2008-10-31 18:49:33
7楼2008-11-04 10:04:48
8楼2008-11-04 11:44:48

9楼2008-11-04 18:05:52












回复此楼