Generalized Synthesis of cis- and trans-Dioxorhenium(V) (Bi)pyridyl Complexes

摘要

Efficient new synthetic routes to trans-(O)-2Re(py-X)2(py-Y)2+ and cis-(O)2Re(bpy-Y2)(py-X)2+ complexes have been devised (py is pyridine; bpy is 2,2'-bipyridine). The new routes make use of labile cis-(O)2Re(py-X)2(I) species as preparative intermediates. The most useful new features of the synthetic chemistry are: (1) the ability to prepare trans species containing electron-withdrawing substituents, (2) the ability to prepare mixed-ligand trans-dioxorhenium species. and (3) generalization of the cis-dioxorhenium preparation.