A series of novel mixed thiophene-pyrrole penta- and heptacyclic oligomers has been prepared in which two pyrrole nitrogens of each oligomer are connected by a polymethylene bridge. The steric constraints produced in these bridged compounds are reflected in their spectroscopic and electrochemical properties.
New Thiophene−Pyrrole-Derived Annulenes Containing 6 and 10 Heterocyclic Units
作者:Masatoshi Kozaki、James P. Parakka、Michael P. Cava
DOI:10.1021/jo960214s
日期:1996.1.1
thiophene-pyrrole-derived annulenes containing either 6 (9a-c) or 10 (14a,band 17) heterocyclic units and 2 vinylene bridges have been synthesized from the appropriate dialdehydes or tetraaldehydes by the McMurry coupling reaction. All of these annulenes except 17 contain one or two intramolecular aliphatic chains linking the pyrrole units. Spectroscopic properties of these annulenes show no evidence for