The reactionenthalpy for O atom transfer from Cp*ReO3 toPPh3 in toluene solution is measured to be −28.4 ± 0.3kcal/mol and −28.0 ± 0.6 kcal/mol in THF solution. This allowsthe strength of the ReO bond in Cp*ReO3 (in solution) tobe estimated at 116.8 ± 1.2kcal/mol.
The reaction enthalpy for O atom transferfrom Cp*ReO3 to PPh3 in toluene solution ismeasuredto be −28.4 ± 0.3 kcal/mol and −28.0 ± 0.6kcal/molin THF solution. This allows the strength of theReObond in Cp*ReO3 (in solution) to be estimated at116.8± 1.2 kcal/mol.