The complexes given in the title were synthesized by partial protolysis of eta-3,eta-2,eta-3-dodeca-2(Z),6(E),10(Z)-trien-1,10-diylnickel(II) in ether with the corresponding protonic acids. They were characterized C-13-NMR spectroscopically and tested on their catalytic properties with butadiene under standard conditions. With increasing tendency of coordination of the anion a strongly decreasing catalytic activity and cis-selectivity was found. For interpretation of the anion influence in the catalytic structure-reactivity relationship a proper reaction model is presented explicitely.
The preparation of finely divided metal powders and transition metal complexes using “organically solvated” magnesium
作者:Helmut Bönnemann、Borislav Bogdanović、Rainer Brinkmann、Bernd Spliethoff、Da-Wei He
DOI:10.1016/0022-328x(93)83004-f
日期:1993.6
Mg★ is an excellent in situ reducing agent for transition metal salts, giving highly reactive metal powders of Groups 8–12. In the presence of electron donor ligands, this reduction provides a useful one-step route to organotransition metal complexes. The application of 35 kHz ultrasound during the reaction improves the dispersity of the metal powders and enhances the yields of the complexes.