218604-62-7

Basic information

• Product Name: 2-(3',5'-di-tert-butyl)phenylindene
• Synonyms: 2-(3',5'-di-tert-butyl)phenylindene
• CAS NO: 218604-62-7
• Molecular Weight: 304.475
• Mol File: 218604-62-7.mol
• Article Data: 5

Chemical Properties

• CAS DataBase Reference: 2-(3',5'-di-tert-butyl)phenylindene(CAS DataBase Reference)
• NIST Chemistry Reference: 2-(3',5'-di-tert-butyl)phenylindene(218604-62-7)
• EPA Substance Registry System: 2-(3',5'-di-tert-butyl)phenylindene(218604-62-7)

Safety Data

• Hazardous Substances Data: 218604-62-7(Hazardous Substances Data)

Upstream product

• 612-12-4 o-Xylylene dichloride 
• 64277-87-8 methyl 3,5-di(tert-butyl)benzoate 
• 22385-77-9 1-bromo-3,5-di-tert-butylbenzene 
• 10485-09-3 2-bromoindene 
• 197223-39-5 3,5-di-tert-butylphenyl boronic acid 
• 594-19-4 tert.-butyl lithium 
• 16225-26-6 3,5-di-tert-butylbenzoic acid 
• 1460-02-2 1,3,5-Tri-tert-butylbenzene 

Relevant articles and documents

High comonomer selectivity in ethylene/hexene copolymerization by unbridged indenyl metallocenes

Catalysts derived from unbridged 2-arylindene metallocenes of Hf and Zr are active for ethylene/hexene copolymerization and show a much higher selectivity toward hexene than unsubstituted bis(indenyl) metallocenes. The ligand substitution pattern and the

Propylene polymerization with sterically hindered unbridged 2-arylindene metallocenes

Metallocene catalyst systems derived from bis(2-phenylindenyl)zirconium dichloride (1) yield elastomeric polypropylenes of low to intermediate tacticity. The sterically hindered metallocene bis(2-(3,5-di-tert-butylphenyl)indenyl)zirconium dichloride (2) produces polypropylenes of much higher isotacticity than 1 ([mmmm] = 78% vs 44% in liquid propylene). Kinetic profiles of polymerizations conducted with 1/MMAO and 2/MMAO reveal that the initial rates of polymerization increase with increasing temperature; the activity of both catalysts decreases with time, but the decrease is less pronounced for 2/MMAO than for 1/MMAO. The polymer microstructure is highly dependent upon polymerization conditions: isotacticity decreases with increasing temperature and decreasing monomer concentration. Lower tacticity polypropylenes ([mmmm] = 40%) generated with 2/MMAO at low monomer concentrations contain a high percentage of [mmrm] stereoerrors, which is indicative of a stereoblock microstructure comprised of isotactic stereosequences of opposite relative configuration. Activation of bis(2-(3,5-di-tert-butylphenyl)indenyl)zirconium dimethyl (3) with [Ph3C] [B(C6F5)4] (4) or B(C6F5)3 (5) yielded catalysts with quite different polymerization behavior. A modest drop in productivity and isotacticity in propylene polymerization is observed when 3 is activated with 4, relative to MMAO, but catalysts derived from 3/B(C6F5)3 exhibited low productivity and afforded amorphous polypropylenes of very low tacticity ([mmmm] = 12%).

LIGANDS AND CATALYSTS FOR PRODUCING ELASTOMERIC PROPYLENE POLYMERS

A ligand useful to form a metallocene olefin polymerization catalyst comprises:wherein at least R3 and R4 are substituents having at least a bulk of a t-butyl group and, optionally, wherein R1 or R2 may be a bulky substituent group.