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Note: Three mechanistic possibilities were proposed to describe the formation of the key intermediate observed in the kinetic studies. Density functional theory calculations (B3LYP/6-31G(d, were carried out on simpler model systems to explore these mechanisms. The first two mechanisms proposed a rearrangement of the substituent from N2 to N1 of I via a five-membered ring transition state as shown in Figure 10. The computed activation energy barrier (Eact) for this rearrangement was extremely high ∼68 kcal/mol, This can be attributed to the overwhelming strain involved in the five-membered ring transition state to achieve the N2 to N1 rearrangement. Transition structure geometry and activation energy barrier for the proposed N2 to N1 rearrangement via five-membered ring transition state
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act) for this rearrangement was extremely high (∼68 kcal/mol). This can be attributed to the overwhelming strain involved in the five-membered ring transition state to achieve the N2 to N1 rearrangement. Transition structure geometry and activation energy barrier for the proposed N2 to N1 rearrangement via five-membered ring transition state.
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