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yifeng1206

铁杆木虫 (著名写手)

翻译EPI: 21
应助: 75 (初中生)
金币: 6164.4
散金: 1350
红花: 22
帖子: 1510
在线: 863.7小时
虫号: 734148
注册: 2009-03-29
性别: MM
专业: 生物材料

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cmj-nankai(RXMCDM代发): 金币+50, 多谢应助！ 2015-04-18 00:03:43
cmj-nankai(RXMCDM代发): 金币+10 2015-04-18 00:03:50
RXMCDM: 翻译EPI+1 2015-04-18 00:03:55

Preperation of sulfonium gel
The most part of sulfonium gels have been obtained by alkylation of sulfides (or of thiols) with the alcohol (or the ether) in acidic medium.
Salt of alkyl diphenyl sulfonium. The preparation of salt of alkyl-(saturated) diphenyl sulfonium have been described recently.
Triflate of diphenyphenylsulfonium. At 3.7 ml (0.2mol) anhydrous Ph2S in 200ml pentane and 10ml of CH2Cl2 containing 10ml (0.1mol) phenol cooled to -40C and under argon, we add 16.8ml trifluoromethanesulfonic anhydride. After 16h at -40C, we stop the agitation. The solvent is canceled and the solid washed in pentane, and then dissolved in a CH2Cl-Et2O mixture and finally cooled to -78C for several hours. The solid who has precipitated is stripped from solvent and dried at -40C under 10-3mmHg during 5 h. We obtained approximate 20g (50%) of crystals very unstable. NMR…..

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