摘要:
Gas-phase C-H bond dissociation enthalpies (BDEs) in norbornane were determined by quantum chemistry calculations and the C2-H BDE was experimentally obtained for the first time by time-resolved photoacoustic calorimetry. CBS-Q and CBS-QB3 methods were used to derive the values DH degrees(C1-H) = 449 kJ mol(-1), DH degrees(C7-H) = 439 kJ mol(-1), and DH degrees(C2-H) = 413 kJ mol(-1). The experimental result DH degrees(C2-H) = 414.6 +/- 5.4 kJ mol(-1) is in excellent agreement with the theoretical value. The trend DH degrees(C1-H) > DH degrees(C7-H) > DH degrees(C2-H) is discussed.