Forcing the issue: By exploring force-transformed potential energy surfaces of both cis and trans 1,2-disubstituted benzocyclobutene, we unravel the mechanism of force-induced ring-opening. The expected conrotatory process of the cis reactant leading to E,Z product is only observed at very small forces, whereas disrotatory ring-opening yields the E,E dienes at larger forces, which is shown to be a concerted process.
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Ribas‐Ariño et al. (2009) studied this question.
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