Alpha-fluoroacrylic acid ester synthesis via Pd-catalyzed carbonylation
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Solution Overview
Problem
Conventional processes for producing α-fluoroacrylic acid ester result in low yields and high amounts of by-products, making them inefficient and costly due to the complexity of the reaction and difficulty in separating the desired product, leading to increased waste and reduced purity.
Innovation Solution
A process involving the reaction of a compound with Br or Cl, an alcohol, and carbon monoxide in the presence of a transition metal catalyst such as Ni, Pd, or Pt, and a base to produce α-fluoroacrylic acid ester with high starting material conversion, selectivity, and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional processes are used to produce α-fluoroacrylic acid ester, then the reaction can proceed, but the yield is low (82% at most) and by-products are generated in high amounts
Solution Approach 1:
The patent changes the reaction parameters by using a specific catalyst system (Pd(OAc)2 with phosphine ligands), controlling the molar ratios of reactants (1-bromo-1-fluoroethene to alcohol to DMF to catalyst), and optimizing reaction conditions (temperature range 60-100°C, pressure 0.5-2.0 MPa, time 6-12 hours) to achieve high yield (92-97%) and high selectivity (94-98%), thereby resolving the contradiction between productivity and harmful by-products
Solution Approach 2:
The patent introduces a specific catalyst system consisting of Pd(OAc)2 combined with phosphine ligands (such as PPh3, PCy3, or PtBu3) as an intermediary to facilitate the carbonylation reaction. This catalyst system mediates the reaction between 1-bromo-1-fluoroethene and carbon monoxide in the presence of alcohol, enabling high-yield production with minimal by-products, thus resolving the contradiction between productivity and harmful factors
2Ease of manufacture
If conventional processes are used, then the reaction can proceed, but the separation of 2-fluoroacrylic acid is difficult and requires removal of by-products
Solution Approach 1:
The patent optimizes reaction parameters including temperature (60-100°C), pressure (0.5-2.0 MPa), and reaction time (6-12 hours) to maximize product formation and minimize by-product generation. The use of specific catalyst systems and controlled molar ratios ensures high selectivity (94-98%), which simplifies downstream separation and purification processes, making the overall manufacture easier and reducing device complexity
3Productivity
If conventional processes are used, then the reaction can proceed, but large amounts of waste fluids and waste materials are produced
Solution Approach 1:
The patent achieves high starting material conversion (92-97%) through optimized reaction parameters including the use of Pd(OAc)2 catalyst with phosphine ligands, controlled temperature (60-100°C), pressure (0.5-2.0 MPa), and specific molar ratios of reactants. This high conversion rate minimizes unreacted starting materials and by-product formation, thereby reducing waste materials and improving atomic economy
Solution Approach 2:
The patent converts the potentially harmful effect of using brominated starting materials (1-bromo-1-fluoroethene) into a benefit by utilizing the bromine atom as a good leaving group that facilitates the carbonylation reaction. The reaction conditions are optimized so that the bromine is efficiently replaced, converting what could be a source of waste into a driving force for high-yield product formation with minimal waste generation
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 process achieves a high yield and selectivity of α-fluoroacrylic acid ester, reducing by-products and simplifying purification, thereby improving industrial applicability as a synthetic intermediate.
Implementation Method 1
reacting 1-bromo-1-fluoroethene with an alcohol and carbon monoxide in the presence of a Pd catalyst
Data Source
AI summary
The object of the present invention is to provide a process for producing α-fluoroacrylic acid ester at a high starting material conversion, high selectivity, and high yield. The present invention provides a process for producing the compound represented by the formula (1) wherein R represents alkyl optionally substituted with one or more fluorine atoms, the process comprising step A of reacting a compound represented by the formula (2) wherein X represents a bromine atom or a chlorine atom with an alcohol represented by the formula (3) wherein the symbol is as defined above, and carbon monoxide in the presence of a transition metal catalyst and a base to thereby obtain the compound represented by the formula (1). R - O H (3)