Sterically Hindered Nitroxyl Ether Preparation via Carbonyl and Hydroperoxide Reaction
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Solution Overview
Problem
Current processes for preparing sterically hindered nitroxyl ethers often result in low yields, produce mixtures of isomers, and require harsh reaction conditions, making them industrially inefficient and ineffective for specific applications.
Innovation Solution
A process involving the reaction of a sterically hindered nitroxyl radical with a ketone or aldehyde in the presence of a hydroperoxide and a metal catalyst, which allows for high yields, selectivity, and the formation of sterically hindered nitroxyl ethers with defined alkoxide residues, even for compounds that are difficult to prepare with prior methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current processes are used to prepare sterically hindered nitroxyl ethers, then the reaction can be carried out with existing methods, but the yields are low and mixtures of isomers are produced
Solution Approach 1:
The patent changes the reaction parameters by using a carbonyl compound and hydroperoxide system instead of traditional hydrocarbon reactions, achieving both high selectivity for defined alkoxide residues and high yields of nitroxyl ethers
Solution Approach 2:
The patent introduces a carbonyl compound as an intermediary substance that reacts with the nitroxyl radical through a hydroperoxide-mediated mechanism, enabling selective formation of desired products while avoiding isomer mixtures
2Ease of manufacture
If current processes are used to prepare sterically hindered nitroxyl ethers, then the reaction can proceed with existing methodology, but harsh reaction conditions are required
Solution Approach 1:
The patent employs milder reaction conditions by using carbonyl compounds and hydroperoxides at controlled temperatures and pressures, improving ease of manufacture while maintaining high process efficiency and reliability
3Manufacturing precision
If prior art processes are used, then the preparation can be attempted, but defined alkoxide residues cannot be formed instead of mixture of isomers
Solution Approach 1:
The patent achieves formation of defined alkoxide residues by changing the reaction parameters to use specific carbonyl compounds and hydroperoxides, obtaining single isomer products without increasing process complexity
4Productivity
If prior art processes are used, then the reaction can be carried out, but sterically hindered nitroxyl ethers with specific structures cannot be prepared or only with insufficient yield
Solution Approach 1:
The patent develops a universal reaction system using carbonyl compounds and hydroperoxides that can prepare various types of sterically hindered nitroxyl ethers with defined structures, achieving both high yields and broad applicability across different target molecules
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 yields and selectivity, producing sterically hindered nitroxyl ethers that are effective as light and heat stabilizers, flame retardants, and polymerization regulators, with mild reaction conditions and minimal by-product formation.
Implementation Method 1
reacting a sterically hindered nitroxyl compound with a compound containing a carbonyl group, such as a ketone or an aldehyd in the presence of a hydroperoxide and a metal catalyst
Implementation Method 2
reacting a sterically hindered nitroxyl radical with an alkyl radical, which is formed in the reaction of a ketone, aldehyde, diketone or dialdehyde oligoketone or oligoaldehyde with a hydroperoxide
Data Source
AI summary
The present invention relates to a novel process for the preparation of a sterically hindered nitroxyl ether from the corresponding sterically hindered nitroxyl radical by reacting it with a carbonyl compound and a hydroperoxide. The compounds prepared by this process are effective stabilizers for polymers against harmful effects of light, oxygen and/or heat, as flame-retardants for polymers and as polymerization regulators.