Abstract
Thermal rearrangement of compounds 1, 8–11, and 20 results, in each case, in the exclusive migration of the hydrogen (HΛ) not associated with the oxygen substituent. On the other hand, thermolysis of 19, 22, and 23 provides, in each case, a mixture of the two possible sigmatropic rearrangement products. Similar bond reorganization of the hydrocarbon 21 affords the dienes 27 and 28 (98:2, respectively). On the basis of these results, along with those reported earlier, it is proposed that in the transition states for these rearrangements (a) there is an accumulation of electron density at the carbon from which the hydrogen migrates, and (b) this carbon center has a planar or nearly planar geometry.
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