ESR and ENDOR studies of irradiated cysteine HCl: Decarboxylation

摘要

Khyphen;band ESR and ENDOR spectra of irradiated single crystals ofLhyphen;cysteine hydrochloride monohydrate at 65 K provide evidence for an unstable carbonhyphen;centered radical produced by decarboxylation. The unpaired electron is localized in a 2porbital on the alpha carbon. An agr;hyphen;proton hyperfine coupling with principal values minus;104.8, minus;65.4, and minus;33.1 MHz has been measured. Five bgr;hyphen;proton couplings have also been observed, of which three are exchangeable.