Acylphosphine Oxide Synthesis Without Chlorodiphenyl Phosphine
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Solution Overview
Problem
Existing methods for producing acylphosphine oxide compounds, such as (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), face safety hazards, low yield, and environmental pollution due to the use of chlorodiphenyl phosphine and oxidation processes.
Innovation Solution
A method involving the reaction of compound B with compound C in the presence of an organic base and solvent, optionally with a Lewis acid, to produce acylphosphine oxide compounds without using chlorodiphenyl phosphine and oxidation steps, ensuring safety, environmental friendliness, and high yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chlorodiphenyl phosphine and oxidation processes are used to produce acylphosphine oxide compounds, then the compounds can be synthesized, but safety hazards and environmental pollution occur
Solution Approach 1:
The patent removes the harmful chlorodiphenyl phosphine and oxidation steps from the manufacturing process. Instead, it uses a direct reaction between diphenyl phosphine oxide and acyl chloride in the presence of a base, eliminating the unsafe intermediates and harmful oxidation processes while maintaining product synthesis capability
Solution Approach 2:
The patent converts the potentially harmful reaction intermediates into beneficial outcomes by using a controlled reaction mechanism with base catalysis. The reaction proceeds through a stable intermediate complex that decomposes to give the desired product without generating harmful byproducts, turning a potentially dangerous process into a safe and clean synthesis method
2Productivity
If chlorodiphenyl phosphine and oxidation processes are used to produce acylphosphine oxide compounds, then the compounds can be synthesized, but yield is low
Solution Approach 1:
The patent eliminates the source of low yield by removing the multi-step chlorodiphenyl phosphine and oxidation sequence. The direct reaction method uses diphenyl phosphine oxide as the starting material, which reacts directly with acyl chloride through a base-catalyzed mechanism, avoiding losses from intermediate steps and improving overall yield
Solution Approach 2:
The patent changes the reaction parameters by introducing a base catalyst and controlling the reaction conditions (temperature, solvent, stoichiometry). These parameter changes enable the reaction to proceed more efficiently with higher yield while maintaining safety, optimizing both productivity and reliability simultaneously
3Ease of manufacture
If chlorodiphenyl phosphine and oxidation processes are used to produce acylphosphine oxide compounds, then the compounds can be synthesized, but environmental pollution occurs
Solution Approach 1:
The patent extracts and removes the harmful oxidation step and chlorodiphenyl phosphine intermediate from the process. The new method uses a direct condensation reaction that generates no harmful byproducts, eliminating environmental pollution while maintaining manufacturing feasibility through simple reaction conditions and easy workup
Solution Approach 2:
The patent converts a potentially polluting oxidation process into a clean condensation reaction. The base-catalyzed reaction between diphenyl phosphine oxide and acyl chloride proceeds through a stable intermediate that decomposes cleanly to give the desired product with no harmful emissions, turning a environmentally harmful process into an eco-friendly synthesis method
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 produces acylphosphine oxide compounds that are stable, high in purity, and cost-effective, suitable for industrial applications with improved safety and reduced environmental impact.
Implementation Method 1
reacting compound B with compound C in the presence of organic base and organic solvent to obtain the acylphosphine oxide compound
Implementation Method 2
adding Lewis acid into the reaction system including the compound B and the compound C
Data Source
AI summary
Disclosed are an acylphosphine oxide compound and a preparation method therefor, which belong to the field of initiators. The method comprises: reacting compound B and compound C under the conditions of an organic base and an organic solvent so as to obtain the acylphosphine oxide compound. The chemical structural formula of compound B is as follows:the chemical structural formula of compound C is as follows:andthe chemical structural formula of the acyl phosphine oxide compound is as follows:wherein R1 is hydrogen, a C1-C6 alkyl group, methoxy, methylthio, dimethylamino, chloroformyl, phenyl, benzoyl, (4-dimethylamino) phenyl, α-naphthyl, β-naphthyl or (9-ethyl-9H-carbazole)-3-yl, R2 and R1 are the same, n is the substitution number of R1 on the corresponding phenyl ring, and is 1, 2 or 3, and m is the substitution number of R2 on the corresponding phenyl ring, and is 1, 2 or 3. The preparation method is safe and environmentally friendly, and has a high yield.