Rate acceleration of the intramolecular diels-alder reaction with furan-diene by anchoring substitution : The t-butyl effect revisited.
摘要:
Kinetic parameters for the IMDAF reaction of 1b and 2b were compared : k(1b)/k(2b) = 60. The activation parameters for the cyclization of 1b, DELTAH(not-equal) = 83.9 kJ/mol and DELTAS(not-equal) = -71.7 J/(mol.K), do not suggest an entropic basis for acceleration.
Rate acceleration of the intramolecular diels-alder reaction with furan-diene by anchoring substitution : The t-butyl effect revisited.
摘要:
Kinetic parameters for the IMDAF reaction of 1b and 2b were compared : k(1b)/k(2b) = 60. The activation parameters for the cyclization of 1b, DELTAH(not-equal) = 83.9 kJ/mol and DELTAS(not-equal) = -71.7 J/(mol.K), do not suggest an entropic basis for acceleration.