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Anionic Pyrazolylborate Ligands
No.121(August 2004)
The poly(pyrazolyl)borohydrides 1, 2 and 3 are the anionic pyrazolylborate ligands which form stable complexes with transition metal ions.1) In particular, 1 forms tetrahedral or square planar complexes with divalent metal ions. The complexes are soluble in organic solvents, and therefore 1 is used for the extraction of divalent metal ions.2) 2 and 3 are utilized as tridentate ligands for homogeneous metal complex catalyst which are used for regioselective hydrogenation of quinoline3a) and reduction of unactivated ketones.3b)
References
- 1)Reviews
- 2)Solvent extraction of metals with potassium-dihydro-bispyrazolyl-borate
- 3)Pyrazolyl borate ligand and transition metal complexes as a catalyst
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