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Transition state structures for (a) β-hydride migration for the Rh-carbene derived from Rh2(OAc)4 and α-diazobutyrolactone, and (b,c) cyclopropanation by ethylene with carbenes derived from Rh2(OAc)4 and (b) α-diazobutyrolactone and (c) α-diazocaprolactone.
