Reduction of an Hexamethylphosphoramide Degradation Product: A Diazabutadiene
摘要:
Alkali metal over-reduction of an electron acceptor in the presence of a hydrogen atom donor, In hexamethylphosphoramide (HMPA), results in a radical that is not simply the anion radical of the acceptor. This new species exhibits an enigmatic EPR pattern. Using N-15 and H-2 labeling studies, the "HMPA degradation product" was found to be the anion radical of N,N'-dimethyl-1,4-diazabutadiene. DFT calculations support this assignment and a mechanism for its formation.