THE ELECTRONIC STRUCTURE OF THE RESPIRATORY COENZYMES

Abstract
The authors found that in diphosphopyridine nucleotide+(DPN+) the reactive center toward nucleophilic attack should be carbon 4, while the reactive center toward radical attacks should be carbons 2 and 6. In the intermediate radical, DPN+ + e, the reactive center toward free-radical attack should be carbons 2 and 6. In the radical-ion, DPN+ + 2e, the reactive center toward electrophilic attacks should be carbons 2 and 6. These results gave the essential experimental facts about the reduction of DPN+.