Transition metal azolates from metallocenes. Part 1: Dimetallic and trimetallic cyclopentadienylnickel pyrazolates, synthesis and structural studies was written by Rettig, Steven J.;Storr, Alan;Summers, David A.;Thompson, Robert C.;Trotter, James. And the article was included in Canadian Journal of Chemistry in 1997.Recommanded Product: 4-Chloro-3,5-dimethyl-1H-pyrazole This article mentions the following:
The reactions of nickelocene with pyrazoles in benzene solution gave either dimeric compounds, [CpNi(μ-pz)]2, (room temperature conditions) or trimetallic complexes, [CpNi(μ-pz)2]2Ni, (elevated temperature conditions). Both dimeric and trimetallic species were obtained as red crystalline materials and x-ray structural studies are reported for representative samples of each type. Structural features are interpreted and compared with similar, previously reported, Ni pyrazolate structures. Crystals of [CpNi(3,5-diMepz)]2 (C20H24N4Ni2), are orthorhombic, a 15.204(1), b 17.967(2), c 6.9786(9) Å, Z = 4, space group Ama2; those of [CpNi(4-NO2-3,5-diMepz)]2 (C20H22N6Ni2O2), are orthorhombic, a 17.145(3), b 17.738(1), c 7.006(1) Å, Z = 4, space group P212121; those of [CpNi(3,5-F6diMepz)]2 (C20H12F12N4Ni2), are orthorhombic, a 18.7134(8), b 15.619(2), c 7.7263(9) Å, Z = 4, space group Pnma; those of [CpNi(3,5-diMepz)2]2Ni (C30H38N8Ni3), are triclinic, a 10.078(2), b 16.134(2), c 9.992(1) Å, α 91.586(10), β 111.050(9), γ 86.95(1)°, Z = 2, space group P1; and those of [CpNi(4-Cl-3,5-diMepz)2]2Ni (C30H34Cl4N8Ni3), are monoclinic, a 10.2201(7), b 16.174(1), c 10.7207(9) Å, β 108.193(5)°, Z = 2, space group P21la. The structures were solved by direct (dimetallic species) or Patterson (trimetallic complexes) methods and were refined by full-matrix least-squares procedures to R = 0.035, 0.032, 0.058, 0.032, and 0.033 (Rw = 0.021, 0.026, 0.053, 0.028, and 0.032) for 1157, 1894, 1642, 4499, and 2113 reflections with I ≥ 3σ(F2), resp. In the experiment, the researchers used many compounds, for example, 4-Chloro-3,5-dimethyl-1H-pyrazole (cas: 15953-73-8Recommanded Product: 4-Chloro-3,5-dimethyl-1H-pyrazole).
4-Chloro-3,5-dimethyl-1H-pyrazole (cas: 15953-73-8) belongs to pyrazole derivatives. As is the case with imidazoles, the pyrazole ring offers many opportunities to create new multiring systems that incorporate this heterocycle. Pyrazole rings have been used as core components of several leading non-steroidal anti-inflammatory drugs (NSAIDs) and antihypertensive drugs. It has also been found to be useful as a bifunctional ligand for metal catalysis.Recommanded Product: 4-Chloro-3,5-dimethyl-1H-pyrazole
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics