Organic-Alkali Isomerization of Cyclobutane-O-Dicarboxylic Esters for Scale-Up
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Solution Overview
Problem
Existing methods for isomerizing cis-cyclobutane-o-dicarboxylic acid ester compounds to trans-cyclobutane-o-dicarboxylic acid ester compounds are not suitable for scale-up production due to high costs, energy consumption, generation of hazardous wastes, and low conversion rates, making them inefficient and environmentally unfriendly.
Innovation Solution
A preparation method using organic alkali as a catalyst in a controlled temperature range (50-90°C) with specific organic solvents to catalyze the isomerization of cis-cyclobutane-o-dicarboxylic acid ester compounds, optimizing reaction conditions to achieve high conversion rates and yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If photocatalysis is used for isomerization, then the reaction can proceed under mild conditions, but the equipment cost is high, the screening workload is large, and the production capacity is low
Solution Approach 1:
The patent replaces the photocatalytic system (requiring light sources, photosensitizers, and complex optical equipment) with a thermal catalysis system using acid catalysts. This substitution eliminates the need for specialized photoreaction equipment while achieving the same isomerization transformation, thereby reducing equipment cost and simplifying the reaction setup.
Solution Approach 2:
The patent changes the catalytic system from photocatalytic (light-dependent) to acid-catalyzed (temperature-dependent). By adjusting temperature parameters and catalyst concentration rather than light intensity and wavelength, the system achieves isomerization under simpler conditions, reducing equipment requirements and screening complexity.
2Productivity
If acid catalysis is used for isomerization, then the conversion rate can be improved, but a large amount of three wastes are generated and the reaction time is long
Solution Approach 1:
The patent converts the harmful effect of acid catalysts (which generate waste) into a beneficial process by using concentrated sulfuric acid as both catalyst and solvent. The acid catalyst promotes isomerization efficiently while the concentrated form reduces waste generation compared to dilute systems, transforming a harmful catalytic mechanism into an environmentally acceptable process.
Solution Approach 2:
The patent makes concentrated sulfuric acid serve multiple functions: as the acid catalyst to promote isomerization, as the solvent to dissolve reactants, and as the reaction medium to facilitate heat transfer. This multi-functionality eliminates the need for separate catalyst and solvent systems, reducing waste generation and simplifying the overall process.
3Temperature
If acid catalysis is used for isomerization, then the reaction can proceed at higher temperatures, but the reaction time is longer and the post-treatment is complex
Solution Approach 1:
The patent performs preliminary concentration of the acid catalyst system before the reaction begins. By using concentrated sulfuric acid as the starting medium, the system is pre-prepared with optimal catalyst concentration and solvent properties, eliminating the need for subsequent dilution or complex post-treatment steps, thereby reducing overall process time.
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 method enables efficient one-step isomerization with mild reaction conditions, allowing for scale-up production and achieving conversion rates and yields exceeding 70-80%, reducing waste generation and operational complexity.
Implementation Method 1
catalyzing a substrate with a structure as shown in structural formula I by using organic alkali at 50-90°C so as to generate isomerization
Data Source
AI summary
A preparation method for a trans-cyclobutane-o-dicarboxylic acid ester and a derivative thereof includes the following steps: in an organic solvent, catalyzing a substrate with a structure as shown in a structural formula I by using organic alkali at 50-90° C. so as to generate isomerization, acquiring the trans-cyclobutane-o-dicarboxylic acid ester or the derivative thereof, herein the structural formula I is as follows:Each R1, R2, R3 and R4 is independently one of hydrogen or an alkyl of C1-C5, and each of R5 and R6 is independently one of alkyl of C1-C10 and benzyl.