[34767-44-7] · C5H5Cl3Zr · Trichloro(cyclopentadienyl)zirconium · (MW 262.67)
(catalyst for alkene polymerization2-4)
Physical Data: mp 237-238 °C (dec).
Solubility: insol most noncoordinating solvents; however, it becomes sol in benzene or chloroform in the presence of two equiv of donor agents such as ether, THF, triethylamine, or pyridine.
Form Supplied in: cream solid; readily available as a powder or as the 1,2-dimethoxyethane adduct, CpZrCl3.DME.4
Preparative Methods: photoinduced chlorination of Dichlorobis(cyclopentadienyl)zirconium.1
Purification: can be purified by vacuum sublimation.
Handling, Storage, and Precautions: solid material is moisture sensitive.
Trichloro(cyclopentadienyl)zirconium, along with methylaluminoxane (MAO) as co-catalyst, has been mainly used as a catalyst of alkene polymerizations in Ziegler-Natta type processes. Thus 1,5-hexadiene2 (eq 1) and ethylene3,4 undergo cyclopolymerization in the presence of CpZrCl3/MAO.
Other Zr-containing organometallic complexes can be synthesized from CpZrCl3. Thus optically active (1) was prepared according to eq 2.5
Similarly, an allyl-zirconium complex (2) was obtained as shown in eq 3.6
Emory University, Atlanta, GA, USA