Bar Plot from Scientific Research

In b , the indicated positions of the different substituents of the derivatives of 2 correspond to the labelling shown in the structure of 2 in a . Positive Δ G values (orange bars) indicate an energetically favourable tropylium isomer, while negative Δ G values (purple bar) denote a bias towards Dewar tropylium. For asymmetric substitution patterns that break the C 2 symmetry, the lower energy of the two possible Dewar tropylium isomers has been used to estimate Δ G .

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