Journal
TETRAHEDRON LETTERS
Volume 43, Issue 47, Pages 8485-8488Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(02)02054-3
Keywords
bicyclo[2.2.2]octadiene; isothianaphthene; retro Diels-Alder reaction
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Bi- and tri-isothianaphtliene-alpha,omega-dicarbaidehydes were easily synthesized by using 4,7-dihydro-4,7-ethano-2-benzo[c]thiophene as a useful synthon of 1,3-unsubstituted isothianaphthene. The UV-vis absorptions of oligo-isothianaphthene derivatives exhibit a considerable bathochromic shift compared to the cases of other oligo-thiophene analogs, and their cyclic voltammetry shows narrowed HOMO-LUMO gaps of the isothianaphthene derivatives. This indicates high efficiency of pi-electron delocalization in the oligo-isothianaphthenes along the conjugated backbone. (C) 2002 Elsevier Science Ltd. All rights reserved.
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