1379658-32-8

Basic information

• Product Name: 2-methyl-4-methoxy-7-(3,5-di-tert-butylphenyl)-1H-indene
• Synonyms: 2-methyl-4-methoxy-7-(3,5-di-tert-butylphenyl)-1H-indene
• CAS NO: 1379658-32-8
• Molecular Weight: 348.528
• Mol File: 1379658-32-8.mol
• Article Data: 5

Chemical Properties

• CAS DataBase Reference: 2-methyl-4-methoxy-7-(3,5-di-tert-butylphenyl)-1H-indene(CAS DataBase Reference)
• NIST Chemistry Reference: 2-methyl-4-methoxy-7-(3,5-di-tert-butylphenyl)-1H-indene(1379658-32-8)
• EPA Substance Registry System: 2-methyl-4-methoxy-7-(3,5-di-tert-butylphenyl)-1H-indene(1379658-32-8)

Safety Data

• Hazardous Substances Data: 1379658-32-8(Hazardous Substances Data)

Upstream product

• 1379658-30-6 7-bromo-4-methoxy-2-methyl-1H-indene 
• 197223-39-5 3,5-di-tert-butylphenyl boronic acid 
• 22385-77-9 1-bromo-3,5-di-tert-butylbenzene 
• 144-55-8 sodium hydrogencarbonate 
• 98946-94-2 4-bromo-7-hydroxy-2-methylindanone 
• 36889-09-5 4-bromophenyl methacrylate 
• 106-41-2 4-bromo-phenol 
• 1155261-18-9 4-bromo-7-methoxy-2-methyl-2,3-dihydro-1H-inden-1-one 
• 100-84-5 1-methoxy-3-methyl-benzene 
• 27060-75-9 4-bromo-3-methylanisole 
• 19614-12-1 2-bromo-5-methoxybenzyl bromide 
• 874-98-6 1-bromomethyl-3-methoxybenzene 

Downstream Products

• 1379658-33-9 bis[4-(3′,5′-di-tert-butylphenyl)-7-methoxy-2-methylindenyl]dimethylsilane 
• 1417537-03-1 chloro [4-(3,5-di-tert-butylphenyl)-7-methoxy-2-methyl-1H-inden-1-yl]dimethylsilane 
• 1417537-04-2 [2-methyl-4-phenyl-5-methoxy-6-tert-butyl-1H-inden-1-yl]-[2-methyl-4-(3,5-di-tertbutylphenyl)-7-methoxy-1H-inden-1-yl]dimethylsilane 
• 1613522-89-6 [2-methyl-4-(4-tert-butylphenyl)-6-tert-Butyl-1H-inden-1-yl] [2-methyl-4-(3,5-di-tert-butylphenyl)-7-methoxy-1H-inden-1-yl]dimethylsilane 
• 1613522-83-0 [2-methyl-4-(4-tert-Butylphenyl)-1H-inden-1-yl]-[2-methyl-4-(3,5-di-tert-butylphenyl)-7-methoxy-1H-inden-1-yl]dimethylsilane 

Relevant articles and documents

Ultrarigid Indenyl-based Hafnocene Complexes for the Highly Isoselective Polymerization of Propene: Tunable Polymerization Performance Adopting Various Sterically Demanding 4-Aryl Substituents

Two novel silyl-bridged C2-symmetric (2-methyl-4-aryl-7-methoxy) substituted bisindenyl based ansa-hafnocene complexes of varied steric demand (I, 4-phenyl; II, 4-[(3′,5′-methyl)-phenyl]) were synthesized and examined in the coordinative polymerization of propene. Both complexes enable a comparative study with the state of the art homogeneous metallocene catalyst (III, 4-[(3′,5′-tert-butyl)-phenyl]) for high melting ultrahigh molecular weight isotactic polypropylene. All three activated complexes exhibit extremely concise stereoregularity along with high molecular weights and high melting transitions at low to moderate polymerization temperatures. Increased sterical encumbrance of the 4-aryl substituent prevents the process of chain release reactions more effectively, especially due to enhanced reduction of β-methyl elimination. Accordingly, end group analysis disclosed the highest selectivity toward allylic chain ends as a result of β-methyl elimination with the less sterically encumbered complex I. Examination of the catalytic activity of I-III disclosed considerable impact of the varied 4-aryl substituents on the maximum productivity with respect to the applied polymerization conditions considering the combined influence of activation, monomer diffusion rate, catalyst deactivation, and rate of chain growth.

Catalyst

A catalyst comprising (i) an asymmetric complex of formula (I) wherein M is zirconium or hafnium; each X is a sigma ligand; L is a divalent bridge selected from -R'2C-, -R'2C-CR'2-, -R'2Si-, -R'2Si-SiR'2-, -R'2Ge-, wherein each R' is independently a hydrogen atom, C1-C20-alkyl, tri(C1-C20-alkyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl; R2 and R2' are each independently linear C1-10 hydrocarbyl; R5 and R5' are each independently hydrogen or a C 1-20 hydrocarbyl group; R6 and R6' are each independently hydrogen or a C1-20 hydrocarbyl group; R7 is hydrogen or a C1-20 hydrocarbyl group or is ZR3; Z is O or S, preferably O; R3 is a C1-10 hydrocarbyl group; Ar is an aryl or heteroaryl group having up to 20 carbon atoms optionally substituted by one or more groups R8; Ar' is an aryl or heteroaryl group having up to 20 carbon atoms optionally substituted by one or more groups R8'; R8 and R8' are each independently is a C1-20 hydrocarbyl group; with the proviso that at least one of R6 or R7 is not H; and (ii) a cocatalyst comprising a compound of a group 13 metal, e.g. boron.

Ultra-rigid metallocenes for highly iso- and regiospecific polymerization of propene: The search for the perfect polypropylene helix

Ultra-rigid metallocenes are studied for highly iso- and regiospecific polymerization of propene. A single-crystal X-ray structure is obtained of the rac- and meso- forms of the complex and its rac-Hafnium analogue. For a better understanding typical stru