Nickel Catalyst Composition for Selective Benzyl Alcohol-Azobenzene Coupling
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Solution Overview
Problem
Current catalyst systems for the selective hydrogenative-dehydrogenative coupling of benzyl alcohols with azobenzene require expensive noble metals and phosphine-based ligands, leading to poor selectivities and environmental concerns.
Innovation Solution
Development of a nickel-based catalyst system, free from phosphine ligands, for hydrogenation-dehydrogenation coupling and secondary imine hydrogenation reactions, utilizing a nickel-based catalyst of formula (I) prepared by combining dimethoxy ethane nickel compound with hydroxy bipyridine in specific solvents under inert conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive noble metal catalysts and phosphine-based ligands are used, then catalytic activity is achieved, but cost increases and environmental harm worsens
Solution Approach 1:
The patent replaces expensive noble metal catalysts with inexpensive nickel-based catalysts supported on magnetite nanoparticles. This substitution dramatically reduces cost and environmental impact while maintaining catalytic functionality for the hydrogenative-dehydrogenative coupling reaction.
Solution Approach 2:
The invention changes the chemical composition parameters by using nickel instead of noble metals and employing nitrogen-containing ligands instead of phosphine-based ligands. This parameter change achieves comparable catalytic activity with reduced cost and environmental harm.
2Productivity
If conventional catalyst systems are used, then reactions proceed, but selectivity remains poor
Solution Approach 1:
The patent employs a composite catalyst system consisting of nickel particles supported on magnetite nanoparticles with nitrogen-containing ligands. This composite structure provides both high catalytic activity and improved selectivity for the desired C—N bond forming products.
Solution Approach 2:
The nitrogen-containing ligands act as intermediaries that mediate the interaction between nickel catalyst and reactants, enabling selective hydrogenative-dehydrogenative coupling to form C—N bonds with high selectivity for imine and amine products.
3Reliability
If stoichiometric halide or metallic waste is produced, then C—N bonds are formed, but waste generation increases
Solution Approach 1:
The nickel-based catalyst system enables efficient C—N bond formation through hydrogenative-dehydrogenative coupling that produces water as the only byproduct, eliminating the need for stoichiometric halide or metallic waste-generating methods.
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 nickel-based catalyst achieves high selectivity and efficiency in producing C—N bond-containing compounds, such as imines and amines, with reduced environmental impact and cost, offering dual selectivity for different products using the same reactants.
Implementation Method 1
nickel-based catalyst of formula (I) for hydrogenation-dehydrogenation coupling and secondary imine hydrogenation reactions
Implementation Method 2
secondary imine hydrogenation reactions
Data Source
AI summary
The present disclosure discloses a nickel catalyst of formula (I). The present disclosure also discloses a process of hydrogenation-dehydrogenation coupling catalyzed by catalyst of formula (I). Further, the present disclosure also discloses a process for secondary imine hydrogenation reactions catalyzed by catalyst of formula (I).