Analysis of the thermodynamic parameters for the isomerization with AlBr3 of 2-methyl- to 1-methyl-adamantane, ΔGI0(298)–2·47 ± 0·19 kcal mol–1, ΔHI0–3·37 ± 0·11 kcal mol–1, ΔSI0–3·0 ± 0·3 cal mol–1 deg–1, reveals an enhancement of the total axial methyl strain of 0·9 kcal mol–1 in the rigid adamantane system over that typical of cyclohexanes.
E. M. Engler, K. R. Blanchard and P. V. R. Schleyer, J. Chem. Soc., Chem. Commun., 1972, 1210 DOI: 10.1039/C39720001210
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