Abstract
Nonconcerted Cope‐Rearrangement? 1,2,6,7‐Cyclodecatetraene ThermolysisFrom the pressure and oxygen dependence of the trapping rate a two‐step mechanism for the Cope rearrangement of the title compound is deduced, its energy profile established, and the heat of formation of the intermediate diradical 3 determined. In contrast to the meso compound the rearrangement of the rac isomer proceeds by two competing processes, a concerted and a nonconcerted pathway. The different behavior of the meso and rac compound can be correlated to the boat and chair geometry of the respective transition states.
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