NBS很便宜，25G 13元，买新的用

新的也是淡黄色的，我想重结晶成白色。

这样也能加0.5个金币，佩服！！！

N-Bromosuccinimide (30g) was dissolved rapidly in 3OOmL of boiling water and filtered through a fluted filter paper into a flask immersed in an ice bath, and left for 2h. The crystals were filtered, washed thoroughly with cu lOOmL of ice-cold water and drained on a Buchner funnel before drying under vac over P2O5 or CaC12，

同意楼上的，我处理过2次，第一次按照纯化书上所示，但滤纸上总要析出很多，后来就先烧开500ml水，然后称个50g加入 迅速搅拌溶解抽滤。抽滤瓶里预先放置冰水混合物，虽然晶体不漂亮，但是颜色纯白，过滤后常温真空干燥几天，用起来没有影响

谢谢楼上2位！

用过之后在瓶里充好氮气存放，不易变质