Cyclic Phosphate Synthesis Using White Phosphorus Without Chlorine Reagents
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Solution Overview
Problem
Conventional synthesis of cyclic phosphate compounds requires the use of highly reactive and polluting chemicals like phosphorus oxychloride, leading to environmental harm and high costs, necessitating a more environmentally friendly and cost-effective method.
Innovation Solution
A method involving the reaction of white phosphorus with diaryl phenols in the presence of bases and solvents to form cyclic phosphate compounds without the use of phosphorus trichloride or chlorine gas, utilizing a one-pot process with mild reaction conditions and simple workup procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional synthesis using phosphorus oxychloride is employed, then cyclic phosphate compounds can be synthesized, but environmental pollution and production costs increase due to the use of highly reactive chemicals and generation of large amounts of acid waste
Solution Approach 1:
The patent converts the traditionally harmful phosphorus oxychloride reagent system into a beneficial green chemistry process by using white phosphorus and molecular oxygen. The harmful chlorine-based reagents are replaced with environmentally benign materials, and the harmful acid waste is converted into useful water as the only byproduct. This resolves the contradiction by making the synthesis process environmentally friendly while maintaining manufacturing capability.
Solution Approach 2:
The patent fundamentally changes the chemical parameters of the synthesis system by replacing phosphorus oxychloride with white phosphorus and O2, changing the reaction mechanism from chlorine-based to oxygen-based oxidation. This parameter change eliminates the generation of HCl and other harmful substances, resolving the environmental pollution issue while preserving the ability to synthesize cyclic phosphate compounds.
2Ease of manufacture
If conventional synthesis using phosphorus oxychloride is employed, then cyclic phosphate compounds can be synthesized, but production costs increase due to the need for additional neutralization base and waste treatment
Solution Approach 1:
The patent eliminates the need for costly neutralization base by completely avoiding the generation of acidic waste. The traditional process requires additional base to neutralize HCl, creating salt waste that needs disposal. The green synthesis process produces water instead, eliminating both the neutralization step and associated costs, thereby reducing overall production costs while maintaining synthesis capability.
Solution Approach 2:
The patent eliminates the generation of harmful waste substances that would require costly treatment and disposal. By designing a reaction pathway that produces water instead of HCl and salt waste, the process eliminates the need for waste treatment facilities and associated operational costs, directly reducing production costs.
3Ease of manufacture
If phosphorus trichloride and chlorine gas are used in conventional synthesis, then phosphorus oxychloride can be produced, but environmental harm and safety risks increase
Solution Approach 1:
The patent extracts and eliminates the harmful chlorine gas and phosphorus trichloride steps from the traditional synthesis pathway. Instead of producing phosphorus oxychloride through these harmful intermediates, the invention directly uses white phosphorus and molecular oxygen to achieve the same synthetic goal, removing the environmental harm associated with chlorine-based chemistry.
Solution Approach 2:
The patent replaces the harmful chlorine-based reagent system with benign white phosphorus and oxygen. The harmful phosphorus trichloride and chlorine gas are completely eliminated, and their function is replaced by a green chemistry pathway using O2 as the oxidant, converting a harmful process into a beneficial environmentally friendly one.
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 high yields of cyclic phosphate compounds with reduced environmental impact and lower costs, suitable for applications in organic synthesis and asymmetric catalytic synthesis.
Implementation Method 1
A method involving the reaction of white phosphorus with diaryl phenols in the presence of bases and solvents to form cyclic phosphate compounds
Implementation Method 2
adding white phosphorus and a first base in sequence, followed by heating while stirring to obtain a mixed solution of reactants
Implementation Method 3
at end of the reaction, stopping the heating and then cooling a resulting reaction product to room temperature
Data Source
AI summary
Provided is a method for preparing a cyclic phosphate compound represented by formula (III) or formula (IV) and a derivative thereof. The method includes: step 1), adding a compound of formula (I), a compound of formula (II), and a solvent to a reactor, and then adding white phosphorus and a first base in sequence, followed by heating while stirring to obtain a mixed solution of reactants; and step 2), adding a second base to the mixed solution of reactants, and subjecting a resulting mixture to heating and reaction; at end of the reaction, stopping the heating and then cooling a resulting reaction product to room temperature; and adding an acid to the reactor and conducting acidification to obtain a compound of formula (III) or a compound of formula (IV).