1379658-33-9

Upstream product

• 1155261-18-9 4-bromo-7-methoxy-2-methyl-2,3-dihydro-1H-inden-1-one 
• 1379658-32-8 2-methyl-4-methoxy-7-(3,5-di-tert-butylphenyl)-1H-indene 
• 75-78-5 dimethylsilicon dichloride 
• 1379658-30-6 7-bromo-4-methoxy-2-methyl-1H-indene 
• 197223-39-5 3,5-di-tert-butylphenyl boronic acid 
• 106-41-2 4-bromo-phenol 
• 22385-77-9 1-bromo-3,5-di-tert-butylbenzene 
• 36889-09-5 4-bromophenyl methacrylate 
• 98946-94-2 4-bromo-7-hydroxy-2-methylindanone 
• 1393604-93-7 4-(3',5'-di-tert-butylphenyl)-7-methoxy-2-methylindene 

Relevant academic research and scientific papers

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.

TRANSITION METAL COMPOUND, CATALYST COMPOSITION COMPRISING THE SAME, AND METHOD FOR PREPARING OLEFIN POLYMER USING THE SAME

The present invention relates to a transition metal compound, a catalyst composition comprising the same, and a production method of an olefin polymer using the catalyst composition. According to the present invention, the transition metal compound can have high activity in olefin polymerization reaction as well as can easily control properties such as stereoregularity of the synthesized olefin polymer.COPYRIGHT KIPO 2017

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