Determination of the reaction enthalpy and kinetic parameters for the isomerization of bridged Dewar benzenes to 8,9-disubstituted [6]pracyclophanes by differential scanning calorimetry

Article abstract of DOI:10.1016/0040-4020(95)00072-G

In solution the reaction enthalpy for the thermal isomerization of the Dewar isomers 2a and 2b to their corresponding 8,9-disubstituted [6]paracyclophanes 1a and 1b was determined as -128 ± 13 kJ · mol^-1 and -146 ± 15 kJ · mol^-1, while the activation energies were found to be 101 ± 10 kJ · mol^-1 and 117 ± 12 kJ · mol^-1 respectively. An improved calorimetric technique was employed using samples in sealed NMR tubes.