ChemInform Abstract: Stabilization of the (AlMe2)+ Cation by Crown Ethers.

ChemInform Abstract

The title ion has been observed during attempts to trap species related to Ziegler-Natta catalysis with crown ethers. In a typical experiment the Ti compound (I) is allowed to react with AlMe₃ in the presence of (III). Analogous reactions leading to (IV) may occur with dichlorozirconocene and trichloro-π-cyclopentadienyltitanium. Complex (VI) is formed using (V) or by reaction of CoCl₂ with AlMe₃ and (V) in toluene. The structures of the cations of (IV) and (VI) are of interest for Ziegler-Natta systems with donor ligands. (IV) crystallizes in the space group P2₁/n with Z=4, (VI) in Pnma with Z=4.