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海若qi

铁杆木虫 (著名写手)


小木虫(金币+0.5):给个红包,谢谢回帖交流
怎么不发金币啊,不给你文献了啊
安心做人,认真做事!
11楼2010-01-12 16:55:28
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

海若qi

铁杆木虫 (著名写手)

才给0.5个金币啊
8-Cyclodextrin
(60.0 g, 52.9 mmol) was suspended in 500 mL of water, and NaOH (6.57
g,. 164.0 mmol) in 20 mL of water was added dropwise over 6 min. The
suspension became homogeneous and slightly yellow before the addition
was complete. p-Toluenesulfonyl chloride (10.08 g, 52.9 mmol) in 30 mL
of acetonitrile was added dropwise over 8 min, causing immediate formation
of a white precipitate. After 2 h of stirring at 23 OC the precipitate
was removed by suction filtration and the filtrate refrigerated
overnight at 4 “C. The resulting white precipitate was recovered by
suction filtration and after drying for 12 h (0.005 mmHg) afforded 7.18
g of a pure white solid. A second crop gave 0.207 g which was indistinguishable
from the first in all respects.
安心做人,认真做事!
12楼2010-01-12 16:56:11
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