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All articles of this category Ethyl (nonafluorobutyl)sulfonylacetate ( 2 ) reacts stereo-selectively with substituted benzaldehydes 3 affording ( E )-3-aryl-2-(nonafluorobutyl)sulfonyl-2-propenoates ( E )- 4 , which are good dienophiles. The addition to cyclopentadiene yields exclusively the exo -products 8 .
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MENKE et al. (1994) studied this question.
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