1997 multi-membered O,S-heterocycles

multi-membered O,S-heterocycles (O or S ring members)R 0691

52 - 178Geometrically Constrained Tetrathiafulvalenophanes: Synthesis andCharacterization. — Two fundamentally different strategies are used toprepare the title compounds. One method forms the tetrathiafulvalene (TTF)moiety in the cyclization step by intramolecular coupling of the dithiolone unitsof (I), the other method uses preformed TTF derivatives (III) and (IV) asbuilding blocks to yield cyclophanes containing either one or two TTF units, e.g.trans/cis isomers (VI) and (VII). An electrochemical cis/ trans isomerizationis observed starting either from the cis or from the trans isomer (VII) or (VI).The electrochemical properties of the other new cyclophanes are also reported.— (LAU, J.; BLANCHARD, P.; RIOU, A.; JUBAULT, M.; CAVA, M. P.;BECHER, J.; J. Org. Chem. 62 (1997) 15, 4936-4942; Dep. Chem., OdenseUniv., DK-5230 Odense, Den.; EN)

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