Stepwise palladium-catalyzed cross-coupling between terminal alkynes and vinyl triflates afforded the first cross-conjugated enyne macrocycles constructed of 3-alkylidene-1-propynyl [−C≡C−C(=CR2)−] building blocks, namely, the expanded radialene 1 and the hybrid radialene 2.
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Eisler et al. (1999) studied this question.