Penta-coordinated Tin Catalyst for Cyclic Carbonate Synthesis
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Solution Overview
Problem
Current catalysts for synthesizing cyclic carbonate have low reaction conversion rates and strict reaction conditions, making it challenging to efficiently produce non-isocyanate polyurethane materials under mild conditions.
Innovation Solution
A penta-coordinated metal complex catalyst, specifically tin or titanium-based, is used to react epoxy compounds with carbon dioxide, providing a more reactive catalysis system that enhances the conversion rate of cyclic carbonate production under mild conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current catalysts are used for synthesizing cyclic carbonate, then the reaction can proceed, but the reaction conversion rate is low and strict reaction conditions are required
Solution Approach 1:
The patent modifies the catalyst structure by changing the coordination number to penta-coordinated and introducing specific ligands (ether or furan) to alter the electronic and steric properties of the metal center. This parameter change in catalyst structure enables the reaction to proceed with high conversion rate under mild conditions, resolving the contradiction between productivity and reaction condition complexity
Solution Approach 2:
The patent creates a composite catalyst system combining metal centers (Sn or Ti) with organic ligands containing ether or furan moieties. This composite structure synergistically enhances the catalytic activity and selectivity, allowing the reaction to achieve high conversion rates without requiring strict reaction conditions
2Productivity
If a more reactive catalysis system is developed, then the reaction efficiency increases, but the catalyst structure becomes more complex
Solution Approach 1:
The patent introduces local functional groups (ether or furan ligands) at specific positions around the metal center to create localized electronic environments that enhance catalytic activity. This local modification approach increases reaction efficiency without requiring complete redesign of the entire catalyst structure, thus limiting the increase in overall complexity
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 penta-coordinated catalyst achieves high conversion rates of cyclic carbonate, improving the efficiency and reducing the activation energy required for the cycloaddition reaction, thus facilitating the production of non-isocyanate polyurethane materials.
Implementation Method 1
the compound can be obtained by reacting carbon dioxide with an epoxy compound under the catalysis of a catalyst
Data Source
AI summary
A catalyst and a method for synthesizing cyclic carbonate using the catalyst are provided. The catalyst includes a metal complex shown in formula (I):wherein R1, R2, R4, and R5 are independently a C1-C25 alkyl group, a C1-C25 alkoxy group, a C3-C8 cycloalkyl group, a C6-C25 aryl group, a C6-C25 aryloxy group, a C7-C25 aralkyl group, a C7-C25 aralkoxy group, or halogen; R3 is hydrogen, a C1-C25 alkyl group, a C3-C8 cycloalkyl group, a C6-C25 aryl group, a C6-C25 aryloxy group, a C7-C25 aralkyl group, or a C7-C25 aralkoxy group; M is Sn or Ti; X is Cl, Br, I, or OAc; and L represents ether or furan.