Abstract
The cation radical of canthaxanthin was generated electrochemically in dichloromethane and its solution ENDOR spectrum is reported for the first time. The isotropic proton hyperfine coupling constants are in reasonable agreement with those calculated by RHF-INDO/SP molecular orbital methods for a planar all-trans-polyene conformation. Proton couplings less than 1.1 MHz were not detected due in part to incomplete hyperfine separation and chemical exchange processes.
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