Synthesis and characterization of novel oligoazulenes with mixed ethynyl and butadiynyl bridges

The new oligoazulenes 10-14 with mixed ethynyl and butadiynyl bridges were synthesized by oxidative Eglinton coupling from the readily accessible ethynylazulenes 3, 4, 7, 9 and 15 as well as by Pd/Cu-catalyzed cross-coupling reactions with the appropriate iodoazulenes 5, 6 and 8. (c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006.