Synthetic methods for preparing 1,3-di(2-pyridyl)azulene

The title compound was synthesized either by introduction of another pyridine ring into 3-(2-pyridyl)-1,2,3,8-tetrahydroazulen-1-one or by Stille and Negishi double cross-coupling reactions of 1,3-dihaloazulenes with the corresponding 2-pyridyl reagents.