ol034987w_si_001.pdf (11.14 MB)
Structure Elucidation of Polyene Systems with Extensive Charge DelocalizationCarbocations from Allylic Carotenols
journal contribution
posted on 2003-07-03, 00:00 authored by Geir Kildahl-Andersen, Bjart Frode Lutnaes, Jostein Krane, Synnøve Liaaen-JensenThe structures of two diastereomeric cations, readily prepared from β,β-caroten-4-ol (1) by treatment with trifluoroacetic acid, have been
determined by NIR and NMR spectroscopy, resulting in the complete structure elucidation of the most extensively delocalized carbocations
so far described. Higher partial charge was observed toward the center of the polyene chain (larger filled red circles). Bond reversion occurs
in the central region of the molecule.