THE MONOPOTASSIUM SALT OF THE LIGAND OF A ZIEGLER-NATTA CATALYST

The anion of dipotassium )-dimethyl(tetramethylcyclopentadienyl)silane diide can coordinate to transition metals to form precursors for singl e-component Ziegler-Natta polymerization catalysts. The related monoan ion derivative potassium ino)dimethyl(tetramethyl-cyclopentadienyl)sil anide tetrahydrofuran solvate has been isolated as the first crystalli ne salt of this important ligand family. The tetramethylcyclopentadien yl group in the crystal has a potassium ion on each face, 2.8 angstrom from the center of the five-membered ring; each K atom is bonded to t wo rings and one tetrahydrofuran solvent molecule.