Four-stage amphoteric redox properties and biradicaloid character of tetra-tert-butyldicyclopenta[b;d]thieno[1,2,3-cd;5,6,7-c'd']diphenalene

Angew Chem Int Ed Engl. 2004 Dec 3;43(47):6474-9. doi: 10.1002/anie.200460565.
No abstract available