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“Push-pull” compounds 4 are obtained in good yields in an unusual way by addition of carboxamides 2 to the extremely reactive alkynyl trifluoromethyl sulfone 1. A crucial feature of this reaction is the activation of the triple bond in 1 by the F3CSO2 group. Dimethyl sulfoxide also adds spontaneously to 1.
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Hanack et al. (1989) studied this question.
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