Description

Rac-Dimethylsilylbis-(4-tert-Butyl-2-Methylcyclopentadienyl)Dichlorozirconium(IV) is a highly specialized metallocene catalyst precursor essential for advanced polyolefin synthesis. Its value lies in enabling precise control over polymer microstructure, including tacticity and molecular weight distribution, which is critical for developing high-performance materials. This compound is primarily needed by R&D chemists and process engineers in the petrochemical and polymer industries focused on creating novel polypropylene and polyethylene grades with enhanced properties.

Application

• Catalyst Component for Polyolefin Polymerization: Serves as a key precursor for single-site catalysts in the production of isotactic polypropylene (iPP) and linear low-density polyethylene (LLDPE).
• Advanced Material Research: Used in R&D laboratories to develop new polymer architectures with tailored mechanical, thermal, and optical properties.
• Stereospecific Polymer Synthesis: Enables the synthesis of polymers with specific stereoregularity due to its rac-isomer configuration.
• Co-catalyst Systems: Activated with methylaluminoxane (MAO) or other co-catalysts to form the active catalytic species for olefin polymerization.
• Specialty Elastomers and Plastomers: Applied in the development of ethylene-propylene rubbers and other specialty elastomeric materials.

Basic Information

Product Name	Rac-Dimethylsilylbis-(4-tert-Butyl-2-Methylcyclopentadienyl)Dichlorozirconium(IV)
CAS No.	126060-49-9
Molecular Formula	C26H38Cl2SiZr
Molecular Weight	540.79 g/mol
Synonyms	Dimethylsilyl-bis(4-tert-butyl-2-methyl-1-cyclopentadienyl)zirconium dichloride; rac-Me2Si(4-tBu-2-MeCp)2ZrCl2; rac-Dimethylsilylbis(4-tert-butyl-2-methylcyclopentadienyl)zirconium(IV) dichloride; rac-(4-tBu-2-MeCp)2ZrCl2; Zirconium, dichloro[1,1'-(dimethylsilylene)bis[4-(1,1-dimethylethyl)-2-methyl-η5-cyclopentadienyl]]-, (R)-; rac-Bis(4-tert-butyl-2-methylcyclopentadienyl)zirconium dichloride dimethylsilane bridged; Metallocene Catalyst Precursor CGC-Type
EINECS	Contact for details

Quality Control

Our production of Rac-Dimethylsilylbis-(4-tert-Butyl-2-Methylcyclopentadienyl)Dichlorozirconium(IV) adheres to stringent quality protocols to ensure batch-to-batch consistency and high catalytic activity. Each lot undergoes rigorous analytical testing, including NMR spectroscopy for structural confirmation and elemental analysis (C, H, Cl, Zr) for purity verification. A comprehensive Certificate of Analysis (COA) detailing purity, isomer ratio, and solvent content is provided with every shipment to support your quality assurance and R&D processes.

Storage

Preserve in a tightly closed container, protected from light. Store under an inert atmosphere (argon or nitrogen) at temperatures between 2°C and 8°C. This compound is hygroscopic (moisture-sensitive) and easily oxidized; therefore, it must be handled in a dry, oxygen-free environment. Long-term storage in a freezer is recommended to maintain stability and catalytic performance.

Specification

Item	Specification
Appearance	Orange to red crystalline powder or solid
Identification (NMR)	Conforms to structure
Purity (by 1H NMR)	≥ 95%
Isomer Ratio (rac:meso)	≥ 90:10
Zirconium (Zr) Content	16.0 - 17.5 %
Chloride (Cl) Content	12.5 - 13.5 %
Solvent Residue (by 1H NMR)	≤ 5% (typically toluene or hexane)

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.