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Importantly, reactions with electron-poor a,b-unsaturated aldehydes required a change of solvent to dichloromethane to avoid a competing hetero-[4+2] cycloaddition of these aldehydes with ethyl vinyl ether.

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2Â¥: Originally posted by xiaokaizi at 2011-10-03 19:55:21:
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mas050518(½ð±Ò+5, ·­ÒëEPI+1): Íò·Ö¸Ðл!!! 2011-10-03 22:05:12
Importantly, reactions with electron-poor a,b-unsaturated aldehydes required a change of solvent to dichloromethane to avoid a competing hetero-[4+2] cycloaddition of these aldehydes with ethyl vinyl ether.
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