Abstract
A noncyclic cross-conjugated diene-diyne system undergoes the thiols-triggered vinylogous propargylic rearrangement (vinylogous S N 2' reaction) in the presence of amine leading to isolate enzyme[3]cumulene, which is capable of not only Bergman-type cyclization but also [2+2] cycloaddition reaction to produce benzocyclobutane derivative when heated
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