CC Coupling of N‐Heterocycles at the fac‐Re(CO)3 Fragment: Synthesis of Pyridylimidazole and Bipyridine Ligands. Issue 19 (1st April 2014)

• Record Type: Journal Article
• Authors: Viguri, Maialen Espinal; Pérez , Julio; Riera, Lucía
• Is Part Of: Chemistry. Volume 20:Issue 19(2014)
• Page Start: 5732
• Page End: 5740
• Publication Date: 2014-04-01
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201400155
• Languages: English
• ISSNs: 0947-6539

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>A new family of cationic rhenium tricarbonyl complexes with either two N‐alkylimidazole (N‐RIm) and one pyridine (Py) ligand, or two pyridine and one N‐RIm ligand, [Re(CO)₃(N‐RIm)_{(3−<italic>x</italic>)}(Py)_{<italic>x</italic>}]⁺, has been prepared. The reaction of these complexes with a strong base, followed by an oxidant, selectively afforded 2, 2'‐pyridylimidazole complexes as the result of intramolecular dehydrogenative CC coupling reactions. For tris(pyridine) complexes [Re(CO)₃(Py)₃]⁺ the reaction pattern upon a deprotonation/oxidation sequence is maintained, which allows the generation of complexes with 2, 2'‐bipyridine ligands. In the particular combination of two different types of pyridine ligand in the cationic <italic>fac</italic>‐Re(CO)₃ complexes only the cross‐coupling products with asymmetric 2, 2'‐bipyridine ligands were obtained; the homocoupling products were not observed.</p> </abstract>