Fluoroalkyl Aromatic Synthesis by Thermal Deoxidation at Lower Heat
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Solution Overview
Problem
Existing methods for producing aromatic compounds with a fluoroalkyl group, such as using phenyl trifluoroacetate or 4-fluorophenyl trifluoroacetate, suffer from low yields and inefficiencies, particularly when multiple fluorine atoms are bonded to the benzene ring.
Innovation Solution
A novel method involving either a batch process at 170°C or higher or a gas-phase continuous flow process at 500°C or higher is used to thermally deoxidize compounds with fluoroalkyl groups, utilizing specific reaction conditions and containers to enhance production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal deoxidation is performed at high temperature (650°C) in a quartz glass tube, then the reaction proceeds, but the yield of target product is low (15.5% for phenyl trifluoroacetate, 2.0% for 4-fluorophenyl trifluoroacetate)
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperature (650°C) to a lower temperature range (170°C or higher, preferably 200-400°C for batch process, or 500°C or higher for gas-phase continuous flow). This parameter change dramatically improves the yield of aromatic compounds with fluoroalkyl groups while reducing energy consumption, resolving the contradiction between productivity and energy loss.
Solution Approach 2:
The patent introduces two different dynamic processes: batch process for lower temperature operation and gas-phase continuous flow process for higher temperature operation. This dynamic approach allows optimization of reaction conditions to achieve high yields while controlling energy input, thereby resolving the contradiction between productivity and energy efficiency.
2Reliability
If multiple fluorine atoms are bonded to the benzene ring, then the compound has desired chemical properties, but the yield of target product decreases significantly
Solution Approach 1:
The patent applies parameter changes in temperature and reaction conditions that enable high yields even when multiple fluorine atoms are present on the benzene ring. The optimized temperature range (170°C or higher, preferably 200-400°C) and pressure conditions (0.05 to 1.00 MPa gauge pressure) allow the reaction to proceed efficiently without decomposing the fluoroalkyl groups, thus maintaining both chemical stability and high productivity.
3Productivity
If batch process is used at 170°C or higher, then production efficiency improves, but reaction time and temperature control complexity increase
Solution Approach 1:
The patent provides dynamic options: batch process for controlled lower temperature operation (170°C or higher, preferably 200-400°C) and gas-phase continuous flow process for higher temperature operation (500°C or higher). This dynamic approach allows selection based on specific production needs, balancing productivity improvement against control system complexity.
4Speed
If gas-phase continuous flow process is used at 500°C or higher, then reaction speed increases, but energy consumption increases
Solution Approach 1:
The patent optimizes temperature parameters by providing two regimes: batch process at 170°C or higher (preferably 200-400°C) for energy-efficient operation, and gas-phase continuous flow at 500°C or higher for rapid reaction when speed is prioritized. This parameter optimization resolves the contradiction between reaction speed and energy consumption by allowing selection based on specific process requirements.
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 significantly improves the yield and selectivity of aromatic compounds with fluoroalkyl groups, even when multiple fluorine atoms are present, reducing the production of by-products and facilitating their use in applications like etching gases and cleaning gases.
Implementation Method 1
flow the starting material through a quartz glass tube while heating to 650°C, and thermally deoxidize it to obtain trifluoromethylbenzene or 1-fluoro-4-fluorophenylbenzene
Data Source
AI summary
Provided is a novel method that can efficiently produce an aromatic compound having a fluoroalkyl group. The method for producing a compound represented by formula (1): wherein each R1 is the same or different and represents a fluoroalkyl group, and n represents an integer of 2 to 5, the method comprising a step of heating a compound represented by formula (2): wherein R1 and n are the same as above, the heating step satisfying either of the following: (1) using a batch process and heating to 170°C or higher, or (2) using a continuous flow process and heating to 500°C or higher.