Synthesis and dienophilic reactivity of
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C. De Tollenaere; L. Ghosez
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Article
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1997
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Elsevier Science
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French
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1,2-Difluorovinylphenylsulfone 5 was conveniently prepared in three steps from chlorotrifluoroethylene. Both E and Z isomers of 5 gave excellent yields of [4+2] cycloadducts with cyclopentadiene. The E isomer reacted with high kinetic exo selectivity. 1,2-Difluorovinylphenylsulfone 5 did not give cy