The synthesis of three new unsymmetrical tetrathiafulvalenes (TTFs), a
ll fused with dihydrooxathiino rings, is described. The new donors all
showed two reversible cyclic voltammetric halfwaves at values lower o
r similar to the value of bis(ethylenedithio)-TTF. The dimethyl deriva
tive DMOX-TTF, 5, gave well formed radical cation salts of close to 2:
1 stoichiometry with several anions.