2,3-Dicyanopropionic Acid Ester Synthesis via Sodium Cyanide
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Solution Overview
Problem
The existing methods for synthesizing 2,3-dicyanopropionate derivatives face challenges due to the instability and high water solubility of formaldehyde cyanohydrin, requiring tedious extraction processes and risking violent decomposition, leading to low yields and purity.
Innovation Solution
A process involving the treatment of sodium cyanide with 2-cyano-2-propenoic acid ester in a solvent at controlled temperatures, followed by neutralization, which eliminates the need for unstable reactants and reduces the formation of dimeric side products, resulting in a high-yielding and pure 2,3-dicyanopropionic acid ester production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If formaldehyde cyanohydrin is used as a reactant to synthesize 2,3-dicyanopropionate derivatives, then the synthesis can be performed, but the reactant is less stable, polymerizes easily in presence of alkali and undergoes spontaneous and violent decomposition
Solution Approach 1:
The patent extracts and eliminates the unstable formaldehyde cyanohydrin reactant from the synthesis process. Instead of using formaldehyde cyanohydrin, the patent employs a different reaction pathway involving cyanoacetate and a carbonyl compound that does not require isolation or handling of unstable intermediates, thereby maintaining synthesis feasibility while removing the stability issue
Solution Approach 2:
The patent introduces a stable intermediate compound (such as a cyanohydrin derivative or β-cyano ester) that serves as a mediator in the reaction sequence. This intermediate is more stable than formaldehyde cyanohydrin and can be handled safely, while still leading to the desired 2,3-dicyanopropionate product through controlled reaction steps
2Manufacturing precision
If formaldehyde cyanohydrin is isolated through continuous extraction with polar solvent such as ether, then the product can be obtained, but the isolation process is tedious and lengthy
Solution Approach 1:
The patent removes the problematic extraction step from the process by designing a synthesis route where the product can be obtained directly or through simpler purification methods. The reaction is designed to avoid formation of highly water-soluble intermediates that require tedious extraction, thereby reducing time while maintaining purity
Solution Approach 2:
The patent changes the reaction parameters and conditions to favor direct formation of the product or stable intermediates that are easier to isolate. By adjusting pH, temperature, or solvent choices, the patent enables a more efficient separation process that reduces extraction time while maintaining product purity
3Productivity
If formaldehyde cyanohydrin is used in the reaction, then the synthesis can proceed, but the risk of formation of dimeric side-products increases
Solution Approach 1:
The patent eliminates the source of dimeric side-products by removing formaldehyde cyanohydrin from the reaction system. The alternative reaction pathway uses reagents that do not undergo dimerization, thereby preventing harmful side-product formation while maintaining or improving synthesis yield
Solution Approach 2:
The patent takes preliminary measures to prevent dimeric side-product formation by choosing reagents and conditions that are inherently resistant to dimerization. The reaction is designed to proceed through a mechanism that avoids the formation of reactive intermediates prone to dimerization, thereby preventing harmful effects before they can occur
4Ease of manufacture
If unstable reactants are used to synthesize 2,3-dicyanopropionate derivatives, then the synthesis can be performed, but violent decomposition occurs
Solution Approach 1:
The patent removes the unstable reactants that cause violent decomposition from the synthesis process. By replacing them with stable alternatives, the patent maintains synthesis capability while eliminating the harmful decomposition effect
Solution Approach 2:
The patent takes beforehand measures to prevent violent decomposition by using stable reagents and controlling reaction conditions. The reaction is designed to proceed under conditions that prevent runaway reactions or violent decomposition, thereby cushioning against harmful effects before they can occur
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
This process achieves high purity and yield of 2,3-dicyanopropionic acid esters by using stable reactants and a single pot reaction, avoiding the complications associated with formaldehyde cyanohydrin, such as violent decomposition and tedious extraction.
Implementation Method 1
treating sodium cyanide in a solvent with a solution of 2-cyano-2-propenoic acid ester of formula (II) at a temperature ranging between 0 °C and 50 °C for a time period ranging between 2 hours and 15 hours
Implementation Method 2
followed by cooling below 20 °C to obtain a sodium salt of 2, 3-dicyanopropionic acid ester of formula (I)
Implementation Method 3
ii) neutralizing the sodium salt of 2, 3-dicyanopropionic acid ester using a neutralizing agent to obtain a 2, 3-dicyanopropionic acid ester of formula (I)
Data Source
AI summary
The present disclosure provides a process for preparing 2, 3-dicyanopropionic acid ester of formula (I); said process comprising the following steps: i) treating an alkali metal cyanide dissolved in a solvent with a solution of 2-cyano-2-propenoic acid ester of formula (II) at a temperature ranging between 0 °C and 50 °C for a time period ranging between 2 hours and 15 hours followed by cooling below 20 °C to obtain a sodium salt of 2, 3-dicyanopropionic acid ester of formula (I); and (II) ii) neutralizing the sodium salt of 2, 3-dicyanopropionic acid ester using a neutralizing agent to obtain a 2, 3-dicyanopropionic acid ester of formula (I), (I)