作者:Brad D. Rose、Steven J. Peters、Richard C. Reiter、Cheryl D. Stevenson
DOI:10.1021/ol901798s
日期:2009.10.15
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.