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594306435(金币+24, 翻译EPI+1):谢谢 2011-01-12 21:14:29
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.
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