Conformational Analysis. V. The Reaction of cis- and trans-4-t-Butylcyclohexanol and trans-4-Methylcyclohexanol with Phosphorus Pentabromide. Syntheses of Alkylcyclohexyl Bromides1
Solution thermodynamic studies. 5. A thermodynamic study of solvent effects on the relative stability of diastereoisomers. The trans-1,2-dibromo-4-tert-butylcyclohexane, trans-2,3-dibromodecalin, and 1-bromo-4-tert-butylcyclohexane systems
作者:J. J. Moura Ramos、L. Dumont、M. L. Stien、J. Reisse
DOI:10.1021/ja00532a028
日期:1980.6
precise description of the solvent influence on the relativestability of the stereoisomers of the title compounds. This solvent influence is important since it is higher than 1 kcal/mol in solvents like C6H6 or acetone with respect to cyclohexane (in terms of enthalpy contribution). The antagonist entropy contribution does not cancel out the enthalpy contribution. The solvent effect, therefore, remains
A direct experimental and theoretical study of solvent effects on the equilibrium between trans cis and trans trans 1,2-dibromo-4-t-butylcyclohexane
作者:Michael H. Abraham、Luigi E. Xodo、Raymond J. Abraham、Michael J. Cook
DOI:10.1016/s0040-4039(01)92454-2
日期:1981.1
The change in ΔG° for the equilibrium (1) ⇌ (2), R=t-Bu, has been measured for the gas phase and a range of solvents, thus providing a direct test of solvation theories. It is shown that reaction-field theory gives a quantitative explanation of the observed results, with the exception of the anomalous hydroxylic and aromatic solvents.