Switching off the best: The addition of TCNE and TCNQ to triple bonds is promoted by donor substitution of the acetylenic substrates. This study investigates the activation strength of different donors in this transformation. Selective switching-off of the strong anilino donor by protonation forces the cycloaddition-retro-electrocyclization of TCNE to the triple bond adjacent to the weaker ferrocenyl donor to form the usually unfavorable product.
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Jordan et al. (2010) studied this question.
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