Ina Hegelmann, Alexander D. Beck, Christiane Eichhorn
2003
Citations
0
Influential Citations
53
Citations
Journal
European Journal of Inorganic Chemistry
Abstract
The synthesis of the new chiral ligand (3,5-di-tertbutylpyrazol-1-yl)(3 ,5 -dimethylpyrazol-1-yl)acetic acid (bpaHtBu2,Me2) (4) has been achieved. Two different synthetic routes to its precursor 3,5-di-tert-butyl-1-[(3,5-dimethyl-1Hpyrazol-1-yl)methyl]-1H-pyrazole (bpmtBu2,Me2) (3) are reported. Deprotonation at the methylene group, followed by reaction with carbon dioxide, yielded a racemic mixture of 4. The chemical behaviour of bis(3,5-di-tert-butylpyrazol-1yl)acetic acid (bdtbpzaH) (2) and the new chiral N,N,O scorpionate ligand 4 involving their coordination to zinc ions was studied. [Zn(bpatBu2,Me2)Cl] (5) was formed from a mixture of ZnCl2, 4 and base. Reaction of bis(3,5-di-tert-butylpyrazol-1yl)acetic acid (bdtbpzaH) (2) with Zn(CH3)2 or Zn(CH2CH3)2 gave the alkylzinc complexes [Zn(bdtbpza)(CH3)] (6) and