No.121
Anionic Pyrazolylborate Ligands
| P1439 | Potassium Bis(1-pyrazolyl)borohydride (1) |
5g 1g |
| P1440 | Potassium Tris(1-pyrazolyl)borohydride (2) |
5g 1g |
| P1441 | Potassium Tris(3,5-dimethylpyrazol-1-yl)borohydride (3) |
5g |
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
S. Trofimenko, Chem. Rev., 93, 943 (1993).
2) Solvent extraction of metals with potassium-dihydro-bispyrazolyl-borate
R. Shukla, G. N. Rao, Talanta, 57, 633 (2002).
3) Pyrazolyl borate ligand and transition metal complexes as a
catalyst
a)Y. Alvarado, M. Busolo, F. Lopez-Linares, J. Molecl. Catal. A: Chem., 142,
163 (1999).
b)C. Vicente, G. B. Shul'pin, B. Moreno, S. Sabo-Etienne, B. Chaudret, J.
Molecl. Catal. A: Chem., 98, L5 (1995).
S. Trofimenko, Chem. Rev., 93, 943 (1993).
2) Solvent extraction of metals with potassium-dihydro-bispyrazolyl-borate
R. Shukla, G. N. Rao, Talanta, 57, 633 (2002).
3) Pyrazolyl borate ligand and transition metal complexes as a
catalyst
a)Y. Alvarado, M. Busolo, F. Lopez-Linares, J. Molecl. Catal. A: Chem., 142,
163 (1999).
b)C. Vicente, G. B. Shul'pin, B. Moreno, S. Sabo-Etienne, B. Chaudret, J.
Molecl. Catal. A: Chem., 98, L5 (1995).
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