Electrochemical Oxidation of Cycloalkanes Without Metal Oxidants
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Solution Overview
Problem
Existing methods for producing α,ω-dicarboxylic acids and cycloalkanones from cycloalkenes and cycloalkanes are resource-intensive, requiring costly transition metals, chemical oxidants, and complex electrolyte systems, leading to high material input and waste generation, with additional steps needed for hydrolysis to obtain free carboxylic acids.
Innovation Solution
A process involving the electrochemical oxidation of cycloalkenes and cycloaliphatic hydrocarbons in the presence of inorganic or organic nitrate salts and oxygen in an electrolysis cell, allowing for the direct conversion to α,ω-dicarboxylic acids and cycloalkanones without transition metals, at ambient pressure and temperature, using electric current as the oxidizing agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If transition metal-catalyzed reactions and chemical oxidants are used to produce α,ω-dicarboxylic acids and cycloalkanones, then the desired products can be obtained, but costly materials are consumed and reagent wastes are generated requiring costly disposal
Solution Approach 1:
The patent replaces chemical oxidants and transition metal catalysts with an electrochemical system using electric current as the oxidizing agent. This substitution eliminates the need for stoichiometric chemical oxidants that generate waste, while using electricity (potentially from renewable sources) as a cleaner energy input. The electrochemical oxidation directly converts cycloalkenes to α,ω-dicarboxylic acids without requiring metal catalysts or chemical oxidizing agents.
Solution Approach 2:
The patent changes the fundamental reaction parameters from thermal/chemical conditions to electrochemical conditions. By applying electric current at controlled potentials, the oxidation process proceeds through different mechanistic pathways that avoid the formation of harmful byproducts. The use of ambient temperature and pressure further optimizes energy efficiency while maintaining high selectivity.
2Reliability
If complex electrolyte systems and additional oxidants are used in conventional processes, then oxidation reactions can proceed, but material input increases and cost balance deteriorates
Solution Approach 1:
The patent extracts and eliminates the need for complex electrolyte systems and additional chemical oxidants by using a simplified electrochemical setup. The system uses only water or simple buffers as the medium, with electric current providing the oxidizing power. This extraction of unnecessary components directly reduces material input and simplifies the overall process while maintaining oxidation efficiency.
Solution Approach 2:
The electrochemical system is self-sufficient, using electricity to directly drive the oxidation without requiring external chemical oxidants. The electric current generates reactive oxygen species in situ at the electrode surface, which then oxidize the cycloalkene substrates. This self-service mechanism eliminates the need for additional oxidant materials and their associated waste streams.
3Ease of manufacture
If conventional methods are used to obtain free carboxylic acids from esters, then the desired products can be obtained, but additional hydrolysis steps are required consuming time and resources
Solution Approach 1:
The electrochemical oxidation process directly produces free carboxylic acids as the final oxidation products, eliminating the need for subsequent hydrolysis steps. By controlling the oxidation conditions and electrode potentials, the reaction proceeds directly to the carboxylic acid stage without forming ester intermediates that would require additional processing. This preliminary action of direct oxidation saves both time and resources.
4Reliability
If transition metals and chemical oxidants are used in the process, then oxidation reactions can be carried out, but environmentally harmful materials are introduced
Solution Approach 1:
The patent substitutes transition metal catalysts and chemical oxidants with an electrochemical system that uses electric current as the oxidizing agent. This replacement eliminates the introduction of environmentally harmful materials into the system, as electricity can be sourced from renewable energy and does not generate toxic byproducts. The only byproduct of the oxidation is water, making the process environmentally benign.
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 is resource-saving, reduces waste generation, and optimizes industrial processes by achieving selective conversion to desired products with high selectivity and minimal auxiliary chemicals, while avoiding environmentally harmful materials.
Implementation Method 1
electrochemically oxidizing the unsubstituted or at least monosubstituted, monounsaturated or polyunsaturated cycloalkene provided in step (a-1) and the unsubstituted or at least monosubstituted, saturated cycloaliphatic hydrocarbon provided in step (a-2)
Implementation Method 2
in an electrolysis cell in a reaction medium in the presence of oxygen
Data Source
AI summary
A process produces unsubstituted or at least monosubstituted α,ω-dicarboxylic acids or ketocarboxylic acids and unsubstituted or at least monosubstituted cycloalkanones by electrochemical oxidation of unsubstituted or at least monosubstituted, monounsaturated or poly unsaturated cycloalkenes and unsubstituted or at least monosubstituted, saturated cycloaliphatic hydrocarbons in the presence of an inorganic or organic nitrate salt in an electrolysis cell in a reaction medium in the presence of oxygen.