Semidiones—X. Radical anions derived from 1,1,2,2-bis(1,3-diketo-2,2-bindanylidene)ethane and 1,1,4,4-bis(1,3-diketo-2,2-bindanylidene)butene-2

The 1,1,2,2-bis(1,3-diketo-2,2-bindanylidene)ethane radical anion (13) and 1,1,4,4-bis (1,3-diketo-2,2-binanylidene)butene-2 radical anion (14) representing 1,6- and 1,8-conjugated semidiones have been prepared by reduction. Electron spin resonance hyperfine splitting constants have been assigned on the basis of Hückel and McLachlan calculations