Metal-ion dependent reactivity of 2-(2'-thienyl)pyridine (Hthpy)

Article abstract of DOI:10.1016/0022-328X(92)83211-Y

The reaction of 2-(2'thienyl)pyridine (Hthpy) with palladium acetate results in a clean conversion to the μ-acetato-bridged dimeric cyclometallated complex <(thpy)Pd(μ-OAc)Pd(thpy)> in which a new Pd-C bond is formed at the 3' position of the thienyl ring.In contrast, treatment with Na under similar conditions only results in the formation of the complex <(HL)AuCl3> in which the ligand acts as a monodentate N-donor.At higher temperatures the reaction of Na with Hthpy yields a complex mixture of products, including complexes of 2-(5'-chloro-2'-thienyl)pyridine and 5,5'-bis(2-pyridyl)-2,2'-bithienyl.Independent syntheses of these latter compounds have confirmed their identities.The reaction of 2-(2'thienyl)pyridine with (bpy = 2,2'-bypyridine) in the presence of a chloride ion abstractor yields salts of the cation ²⁺ which contains a bidentate N,S-bonded ligand.