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cis-Cyclophane-like tetrathiafulvalenes (TTF)7 or 8 with two sulphur atoms linked at the 4 and 4′ positions of the two dithiole moities of the TTF are efficiently obtained from 4-thioxo-mesoionic dithioles; if the linking bridge is too small (less than 8 atoms) a cage-like bis-TTF 9 is obtained.
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Bertho-Thoraval et al. (1991) studied this question.
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