T automerization

McMahon et al. contributed to this field not only by revealing the electronic spectrum of S-37111 but also by elucidating — on the basis of studies with labeled compounds — the complex mechanism of the automerizations and isomerizations of the three C3H2 species S-2, T-36 and S-37.69,112 A complete record, including high level calculations, was published by McMahon.69... 

Balaban, A.T. (1993a) Benzenoid catafusenes perfect matchings, isomerizahon, automerization. Pure e[ Appl. Chem., 65, 1-9. 

The complete retention of the original T position in the product from the liquid-phase reaction indicates that automerization is slow in comparison writh the collision frequency in the condensed phase, in agreement wdth theoretical estimates (18) of the activation energy for Equation 7, ranging from 44 to 77 kcal mol While no direct information is provided by the decay experiments as to the specific mechanism of automerization (H vs. CH-group migration), the results nevertheless exclude any significant intervention of the nonclassical carbene structure... 

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