Recently, our research group has been developing novel reactions involving powerful tetraazaalkene-based donors, reducing aryl halides into their corresponding aryl radicals or aryl anions. This thesis reports the development of new powerful donor D, a novel donor structure prepared by a novel route from precursor A. Oxdation of D into diction E provided suitable material for X-ray crystal analysis and electrochemical measurements of the redox potential for the D/E couple. Comparison with other neutral organic electron donors prepared in our group or published by others showed that the bispyridinylidene-based donors presented in this thesis are the isolated organic reagents with the most negative redox potentials recorded to date.