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| 该反应有两个优点：一是它容易和醛酮反应，有些有三苯基膦制备的磷叶立德，特别是当α碳上带有羰基时，比较稳定，不容易和酮带有，有时需加入苯甲酸作为催化剂。二是反应中的另一产物，O,O-二乙基磷酸钠溶于水，无需像三苯基膦的叶立德时，还需要分离三苯氧膦。三是磷酸酯的反应，立体选择性很强，产物主要是反式。 |
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594306435(金币+24, 翻译EPI+1):谢谢 2011-01-12 21:14:29
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The reaction has three advantages：First, it eadily reacts with aldehyde and ketone.Some phosphorus ylide produced by triphenylphosphine,expecially when α carbon is with carbonyl ,it is comparatively stable and it does not eadily react with ketone,sometimes we need benzoic acid as the catalytic agent.Second,another product of the reaction ,O,O-diethyl-sodium phosphate can be dissolved by water,it does not need to separate triphenylphosphine oxide as the situiation of the phosphorus ylide produced by triphenylphosphine oxide .The third one is the reaction of organic phosphate,its dimensional selectivity is very strong and its product is mainly antiform. |
3楼2011-01-12 20:29:12
