AC Transition-Metal Catalysis for Coupling Without Electrode Fouling
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Solution Overview
Problem
Transition-metal catalysis has limited application in organic synthesis using alternating current (AC) compared to direct current (DC), with no existing methods demonstrating effective coupling reactions.
Innovation Solution
Integrate alternating current (AC) with transition-metal catalysis through electron transfer steps at the same electrode, facilitating reactions like amination, etherification, and esterification by inducing sequential oxidation and reduction processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct current (DC) electrolysis is used to assist transition-metal catalysis, then the coupling reactions can be facilitated through electron transfer, but electrode fouling occurs and limits the application scope
Solution Approach 1:
The patent applies alternating current (AC) instead of direct current (DC) to create periodic oxidation and reduction cycles at the electrode surface. This periodic action prevents fouling by continuously reversing the electrode polarity, preventing accumulation of reaction byproducts on the electrode surface while maintaining catalytic activity throughout the cycle.
Solution Approach 2:
The AC electrolysis method allows the electrode to periodically discard accumulated fouling substances during the reversal phase and recover its catalytic function. The alternating polarity enables the electrode to be cleaned automatically as reaction products are removed during the opposite polarity phase, maintaining sustained catalytic performance.
2Adaptability or versatility
If photoredox catalysis is merged with transition-metal catalysis to enable C—C, C—N, and C—O coupling reactions, then previously elusive reactions become accessible, but the system complexity increases
Solution Approach 1:
The patent merges photoredox catalysis and transition-metal catalysis into a unified dual-catalytic system where both catalysts work synergistically. The photoredox catalyst generates radicals through light-induced electron transfer, while the transition-metal catalyst facilitates bond formation, enabling coupling reactions that are inaccessible to either catalyst alone.
Solution Approach 2:
The combined catalytic system achieves multi-functionality by enabling multiple types of coupling reactions (C—C, C—N, C—O, C—S, C—P, C—Si) through a single integrated approach. The system can adapt to different substrate combinations and reaction types without requiring fundamentally different catalytic mechanisms.
3Reliability
If alternating current (AC) is used for electrosynthesis to prevent electrode fouling, then electrode stability is improved, but the application in transition-metal catalysis is limited
Solution Approach 1:
The patent utilizes the periodic nature of AC electrolysis to create alternating oxidation and reduction phases that facilitate transition-metal catalytic cycles. The periodic reversal of current direction enables the metal catalyst to access multiple oxidation states necessary for catalysis while maintaining electrode stability and preventing fouling throughout the process.
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
AC-assisted transition-metal catalysis enables efficient C—C, C—N, C—O, C—S, C—P, and C—Si couplings with high yields and reduced side products, overcoming limitations of DC methods.
Implementation Method 1
Integrate alternating current (AC) with transition-metal catalysis through electron transfer steps at the same electrode, facilitating reactions like amination, etherification, and esterification by inducing sequential oxidation and reduction processes
Implementation Method 2
inducing sequential oxidation and reduction processes
Implementation Method 3
inducing sequential oxidation and reduction processes
Data Source
AI summary
This invention provides a catalytic process wherein alternating current is used for catalytic coupling (such as C—C, C—N, C—O, C—S, C—P, C—Si and/or C—B couplings) using a transition-metal catalysis.