Wasserlösliche Metallkomplexe und Katalysatoren, IV. 2,2′-Bipyridin-5-sulfonsäure: Synthese, Reinigung, Derivate und Metallkomplexe

✍ Scribed by Herrmann, Wolfgang A. ;Thiel, Werner R. ;Kuchler, Josef G.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1990
• Tongue: English
• Weight: 1002 KB
• Volume: 123
• Category: Article
• ISSN: 0009-2940
• DOI: 10.1002/cber.19901231005

✦ Synopsis

Transition metals / Water-soluble organometallic compounds / Chelating sulfonated ligands Water-Soluble Metal Complexes and Catalysts, IV'). -2,2'-Bipyridine-5-sulfonic Acid Synthesis, Purification, Derivatives and Metal Complexes

The synthesis of 2,2'-bipyridine-5-sulfonic acid (1 a) is achieved and osmium containing carbonyl or 0x0 ligands are prepared by mercury(I1)-catalyzed sulfonation of 2,2'-bipyridine in as examples of chelate complexes with metals in low and high oleum (30% SO3) in 10-50-g amounts. The crude product is oxidation states. The solubility of the complexes is mostly depurified by extraction of l a as tetra(n-buty1)ammonium salt termined by the cations: Sodium salts are usually soluble in into dichloromethane and re-extraction of the free acid with water and/or in short-chained alcohols. Tetra-n-butylammoconc. hydrobromic acid. Melting of 1 a together with potas-nium and tetraphenylphosphonium salts and the sulfonamides sium hydroxide gives 5-hydroxy-2,2'-bipyridine (2). The salts are soluble in polar organic solvents. On the other hand, the 1 bd (Na+, [N(n-C,H&]+, [P(C,H,),]+) and sulfonamides distribution of charge has an influence on solubility. Increased