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Scorpionate ligand

These lithium derivatives were found to be excellent reagents for the introduction of the new amidinate scorpionate ligands into Group 4 metal complexes, and a series of neutral titanium and zirconium complexes were prepared according to Scheme 189 and fully characterized. [Pg.307]

As in the synthesis of bdmpza by Otero et al., the scorpionate ligand bis(3,5-di-fert-butylpyrazoI-l-yI)acetate Hbdtbpza (3c) can be synthesized from bis(3,5-fert-butylpyrazoI-l-yI)methane (bdtbpzm) (2c) by... [Pg.108]

Fig. 11 zinc complexes of N-donor imino, NHC, and scorpionate ligands... [Pg.239]

The first such complex, Tp Ni(NO) (87), was very recently obtained from KTp and [NiBr(NO)(PPh3)2], along with an analogue (88) based on the "soft-scorpionate" ligand hydrotris(2-seleno-l-mesitylimidazolyl)borate (Scheme 9).37 In the same time frame Tpph2Ni(NO) (89) was independently... [Pg.121]

More recently, both our group and Perez s group have demonstrated that Ag complexes 22 and 33 containing scorpionate ligands are effective for C-H insertion... [Pg.242]

The sterically crowded, monoanionic scorpionate ligand tris(3-tert-butyl-5-methylpyrazol-l-yl)borate (Tp,Bll Me) provides a unique environment for the isolation of discrete rare-earth metal complexes with YMe AlMe4) and... [Pg.148]

In a related approach by Zuo and Zhou the same type of donor corner, [TpFe(CN)3], where Tp is a scorpionate ligand with a three-fold axis of symmetry (hydrotris(pyrazolyl)borate), is combined with a higher connectivity acceptor linker, [Cu]2+. As the Cu center adopts a square pyramidal (CN)4Cu(H20) local coordination, the cluster structure observed is one with eight donor corners and... [Pg.197]

Both ligand classes are modelled on long established ligands, the pincer ligands with amino, phosphane or ether sidechains on a pyridine or benzene base for the mer geometry [64-66] and the scorpionate ligands (tris-pyrazolylborates) for the fac geometry [67-69]. [Pg.44]

After the early reviews in 19712 and 19723 on poly(pyrazolyl)borate chemistry and pyrazole-derived ligands, and the boron pyrazole compounds chemistry described in 1986,4 Trofimenko reported in 1986s and in 19936 a summary on the coordination chemistry of poly(pyrazolyl)-borates. In 1999 Trofimenko described the coordination chemistry of scorpionate ligands in a book.7... [Pg.160]

The presence of sufficient pyrazolate ion (pz) is necessary to convert the R2B(pzx) species quickly to the [R2B(pzx)2], otherwise the R2B(pzx) species will dimerize to the stable pyrazabole R2B (/r-pzx)2BR2 (2), which are not readily convertible to scorpionate ligands.34 35... [Pg.162]


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See also in sourсe #XX -- [ Pg.242 ]




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