[1,3]-Sigmatropic rearrangement of 1,3,5-triphosphabicyclo[2.1.0]pent-2-ene
Abstract
The activation barrier for the [1, 3]-phosphorus migration in the title compound is estimated (MP4SDTQ/6–31 G*//MP2/6–31 G*+ ZPE) to be 11.62 kcal mol–1(1 cal = 4.184 J), which is considerably smaller than the barrier (31.13 kcal mol–1) for [1,3]-carbon migration in the corresponding hydrocarbon.