Spectroscopic Evidence for a Radical Cation as Intermediate in a Model Reaction of the 4'-DNA Radical Strand Cleavage

摘要

With strongly improved S/N ratios such as those in multiple laser pulse experiments, weak resonances of 2-methylfuran were detected carrying escape-type polarization, lending further proof for radical cation 9. No resonances were observed in the CIDNP experiment for 6a and its diastereomer 6b, indicating that phosphate elimination is more effective than recombination to the starting material. However, the aldehyde proton of benzaldehyde (10.0 ppm), formed by hydrogen abstraction, was observed in enhanced absorption.