CYCLOMETALLATION OF A PYRROLE RING OF 2-(1-PYRROLYL)PYRIDINE WITH PALLADIUM(II) AND RHODIUM(III)

Article abstract of DOI:10.1016/S0022-328X(00)99167-8

2-(1-Pyrrolyl)pyridine (Hplp) is cyclometallated with lithium tetrachloropalladate(II) and hexahalogenotetrakis(tri-n-butylphosphine)dirhodium(III) to give 2 and (X=Cl, Br; PBu3=tri-n-butylphosphine), respectively, where deprotonated plp is coordinated via the pyridine-N and pyrrole-2C atoms forming a five-membered metallacycle. 2 reacts with pyridine (py) and with PBu3 to form the adducts (L=py, PBu3) and with acetylacetone (Hacac) to afford the complex .Metathesis of with excess lithium iodide gives a mixed halogeno complex .These complexes are characterized spectroscopically.