Cyclometallation of 2-(2-thienyl)pyridine and 2-(3-thienyl)pyridine with palladium(II), rhodium(III) and ruthenium(II) |
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Authors: | Matsuo Nonoyama Sachiyo Kajita |
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Institution: | (1) Department of Chemistry, Faculty of Science, Nagoya University, Chikusa, 464 Nagoya, Japan |
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Abstract: | Summary 2-(2-Thienyl)pyridine H(2-tp)] and 2-(3-thienyl)pyridine H(3-tp)] react with lithium tetrachloropalladate(II), hexachlorotetrakis(tri-n-butylphosphine) dirhodium(III), and tetrachlorohexacarbonyldiruthenium(II) to give PdCl(C-N)]2-(CN=2-tp and 3-tp), RhCl2(C-N)PBu3]2 (C-N = 2-tp and 3-tp), and RuCl(2-tp)(CO)2]2, respectively. Some bromo analogues are also prepared. These complexes react with pyridine and tri-n-butylphosphine to give adducts in which 2-tp is chelated through pyridine-N and thiophene-3-C and 3-tp through pyridine-N and thiophene-2-C atoms. The structures of these complexes are similar to those of the corresponding complexes of cyclometallated 2-phenylpyridine. |
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