Norrish type-II and McLafferty rearrangements, which both involve an intramolecular transfer of a γ H atom, can be differentiated on the femtosecond time scale. The McLafferty rearrangement results in ion fragmentation of the parent ketone, whereas the Norrish type-II reaction leads to a diradical species, which then either cyclizes or fragments (see scheme). For Norrish type-II reactions, the reaction time for the transfer of the hydrogen atom is within 70-90 fs, and the lifetime of the diradical intermediate is in the range of 400-700 ps at the total energy studied.
|Number of pages||4|
|Journal||Angewandte Chemie - International Edition|
|State||Published - 3 Jan 2000|
- Density functional calculations
- Hydrogen transfer
- Norfish reactions