5-Di(hetero)arylfurans are readilyaccessible in a pseudo five-component reactionvia a Sonogashira-Glaser coupling sequence followed by a superbase-mediated (KOH/DMSO) cyclization in a consecutive one-pot fashion. Besides the straightforward synthesis of natural products and biologically active molecules all representatives are particularly interesting due to their bright blue luminescence with remarkably
In contrast to the facile synthon ethynylferrocene for diacetylene ferrocene (Fc) derivatives, 1,1′-diethynylferrocene for the corresponding 1,1′-bis(diacetylene-group)-connected Fc derivatives is extremely difficult to handle under ordinary conditions, giving rise to spontaneous self-polymerization. Under modified Eglinton oxidative coupling conditions, it has been possible to generate 1,1′-diethynylferrocene in situ readily from a trimethylsilyl-protected precursor and to react it with other terminal acetylenes. The present tandem reactions could provide a general synthetic method for an extended π-electronic conjugation system of 1,1′-bis(diacetylene-group)-connected Fc derivatives, of which the chemistry has been scarcely developed.
relationship between the structures and light emission properties of five aryl-substituted pyrrole derivatives was studied during aggregation in THF−water mixtures. Only pentaphenylpyrrole clearly shows, however, an aggregation-induced emissionenhancement (AIEE) phenomenon. On comparison of the optical properties and single-crystal structures of these pyrrole derivatives, it is suggested that the more twisted