Asymmetric Diorganomagnesium Co-Catalyst for Polymer Functionalization
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Solution Overview
Problem
Existing catalytic systems based on rare earth metallocenes for synthesizing polyolefins and copolymers of olefin and conjugated diene face limitations in catalytic activity and functionalization yield, particularly when using conventional organomagnesium co-catalysts like dibutylmagnesium and butyloctylmagnesium.
Innovation Solution
Introduction of an asymmetric diorganomagnesium compound with a specific benzene ring structure, where the carbon atoms ortho to magnesium are substituted differently, acts as a co-catalyst to enhance the catalytic activity and functionalization yield in rare earth metallocene-based systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organomagnesium co-catalysts (dibutylmagnesium, butyloctylmagnesium) are used in rare earth metallocene-based catalytic systems, then the system operates with standard catalytic activity, but the functionalization yield and catalytic activity are limited and insufficient
Solution Approach 1:
The patent introduces asymmetric diorganomagnesium compounds with specific chiral structures where the two R groups attached to magnesium are different (one aromatic group and one aliphatic group with specific stereochemistry). This asymmetry creates a more effective coordination environment for the rare earth metallocene, enhancing both the functionalization yield and catalytic activity compared to symmetric conventional co-catalysts
2Productivity
If conventional organomagnesium co-catalysts are used, then the structure is simple and easy to manufacture, but the catalytic activity and function rate in polymer synthesis are insufficient
Solution Approach 1:
The asymmetric diorganomagnesium compound introduces specific local structural features (chiral centers, specific aromatic-substituent arrangements) at the co-catalyst molecule level. These localized structural modifications create optimal interaction sites with the metallocene and monomer, significantly boosting catalytic activity without requiring complete restructuring of the entire catalytic system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The asymmetric diorganomagnesium compound significantly improves the catalytic activity and functionalization yield of polyolefin copolymers, achieving a 10-11% gain in functionalization reaction yield and up to a 10% increase in catalytic activity compared to conventional co-catalysts.
Implementation Method 1
the metallocene is activated by a co-catalyst that is part of the catalytic system. An organomagnesium, an organoaluminum or an organolithium may be suitable as a co-catalyst
Implementation Method 2
which has a magnesium-carbon bond, which carbon is a constituent carbon atom of a specific benzene ring
Data Source
AI summary
The invention relates to a diorganomagnesium compound of formula RB-Mg-RA, RB being different from RA, RB comprising a benzene ring substituted by the magnesium atom, wherein one of the carbon atoms of the benzene ring on the ortho position of the magnesium is substituted by methyl, ethyl, isopropyl or forms a ring with the carbon atom which is its closest neighbor and which is on a meta position of the magnesium, wherein the other carbon atom of the benzene ring on the ortho position of the magnesium is substituted by methyl, ethyl or isopropyl, RA being substituted or unsubstituted alkyl, cycloalkyl or benzyl, wherein said diorganomagnesium compound is different from n-butylmesityl magnesium. When used as a co-catalyst of a metallocene, it makes it possible to increase the function content in the synthesis of functional polymers.