The thia-analogue 2 of the sixfold Hückel HOMO-degenerate tetrakis(cyclopentadienylidene)xylene biradical 3 and electron-donating tetrathiafulvalene analogues 9 and 13 have been prepared; 13 forms conductive charge-transfer complexes.
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Ohta et al. (1993) studied this question.
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