Dialkyl α-fluoromalonate Synthesis via Normal Pressure Temperature Control
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Solution Overview
Problem
Existing methods for preparing dialkyl α-fluoromalonates require high pressure, long reaction times, and excessive use of hydrogen fluoride and triethylamine, making them unsuitable for industrial use and environmentally inefficient.
Innovation Solution
Reacting dicarbonyl compounds with an addition product of hydrogen fluoride and triethylamine at temperatures of 103° C. to 115° C. under normal pressure, using small excesses of reagents, which significantly reduces reaction time and improves space-time yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the reaction is carried out under high pressure at 103° C. to 130° C., then the reaction proceeds at acceptable speed, but the equipment complexity and safety requirements increase significantly
Solution Approach 1:
The invention changes the pressure parameter from high pressure to normal pressure conditions, while adjusting the temperature range to 103° C. to 115° C. This parameter modification eliminates the need for complex pressure equipment while maintaining acceptable reaction rates through optimized temperature control
2Stress or pressure
If large excesses of hydrogen fluoride and triethylamine are used at 20° C. to 100° C., then the reaction can proceed without high pressure, but the reaction time extends to 72 hours
Solution Approach 1:
The invention changes the temperature parameter to a specific range of 103° C. to 115° C. and normal pressure conditions, which accelerates the reaction rate significantly compared to lower temperature methods, reducing reaction time from 72 hours to a much shorter duration while using only small excesses of reagents
3Productivity
If the reaction is carried out at normal pressure with lower excess of reagents, then the space-time yield improves, but the reaction time was previously extended to 72 hours
Solution Approach 1:
The invention optimizes the temperature parameter to 103° C. to 115° C. under normal pressure conditions, which simultaneously achieves high space-time yield through efficient reagent utilization and maintains short reaction times, resolving the previous trade-off between productivity and time consumption
4Stress or pressure
If high excesses of hydrogen fluoride and triethylamine are used, then the reaction proceeds at normal pressure, but the environmental impact and reagent consumption increase
Solution Approach 1:
The invention changes the temperature to 103° C. to 115° C. under normal pressure, which enhances reaction efficiency and allows the use of only small excesses of hydrogen fluoride and triethylamine, thereby reducing reagent consumption and environmental impact while maintaining feasible pressure conditions
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 method achieves a tenfold improvement in space-time yield, reducing reaction time from 72 hours to 15 hours and minimizing reagent consumption, making it suitable for industrial use while maintaining high yields and environmental sustainability.
Implementation Method 1
dicarbonyl compound of the general structure (II) is reacted with an addition product of hydrogen fluoride and triethylamine at temperatures of 103° C. to 115° C.
Data Source
AI summary
The invention relates to a new, advantageous method for the preparation of dialkyl α-fluoromalonates.