Di- or trisubstituted alkenes of defined geometry, with terminal enamide groups, are formed in an atom-economic three-carbon chain extension of alkynes with allyl amides catalyzed by ruthenium (see, for example, Equation (1); Boc=tert-butoxycarbonyl, TMS=trimethylsilyl).
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Trost et al. (2001) studied this question.
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