Nitrobenzene Oxidation for Aminal Iron (II) Olefin Catalyst Synthesis
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Solution Overview
Problem
Current methods for preparing ethylene oligomerization catalysts are complex, costly, and involve the use of toxic substances like selenium dioxide and potassium cyanide, which complicates the synthesis of ligands and increases the cost and toxicity of the process.
Innovation Solution
A new process for preparing an N ortho acyl substituted nitrogen-containing heterocyclic compound using nitrobenzene as an oxidant, which simplifies the synthesis steps and reduces the use of toxic substances, specifically forming 2-acyl-1,10-phenanthroline and its aminal iron (II) chloride complex for use in ethylene oligomerization catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If selenium dioxide is used as oxidant to prepare 2-acyl quinoline, then the oxidation reaction can proceed, but the process becomes complex and costly due to high toxicity and difficulty in purchasing selenium dioxide
Solution Approach 1:
The patent replaces expensive, toxic selenium dioxide with cheap, readily available nitrobenzene as oxidant. Nitrobenzene is a common chemical that is easy to purchase and handle, making the oxidation process more accessible and cost-effective while maintaining reaction effectiveness.
Solution Approach 2:
The patent converts the typically harmful nitro group in nitrobenzene into a beneficial acyl group through oxidation. The nitro group serves as a precursor that can be transformed into the desired acyl functionality, turning a potential hazard into a useful synthetic intermediate.
2Reliability
If potassium cyanide is used in the reaction to obtain 2-acetyl-1,10-phenanthroline, then the desired product can be formed, but the process becomes highly toxic and complex
Solution Approach 1:
The patent replaces highly toxic potassium cyanide with safe and inexpensive nitrobenzene as the oxidant. This substitution eliminates the need for handling and disposing of cyanide waste, significantly reducing toxicity and simplifying safety protocols while achieving the same product formation.
Solution Approach 2:
The patent eliminates the harmful cyanide reagent entirely and uses nitrobenzene, which can be safely handled and disposed of. The oxidation of nitrobenzene provides both the oxidizing power needed and introduces the acyl group, converting a harmful process into a safe and efficient one.
3Reliability
If complex synthesis steps are used to prepare ligands, then the desired ligand structure can be obtained, but the cost and time of catalyst preparation increase
Solution Approach 1:
The patent incorporates the acyl group introduction step into the ligand synthesis pathway itself, rather than requiring separate post-synthesis modifications. By using nitrobenzene oxidation during the ligand formation process, the acyl-substituted ligand is obtained directly in one sequence, eliminating additional synthesis steps.
Solution Approach 2:
The patent combines the oxidation step with the ligand synthesis step into a single integrated process. The nitrobenzene serves dual purposes: as the oxidant for forming the ligand structure and as the source of the acyl substituent, merging two separate operations into one efficient step.
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 process reduces the complexity and cost of catalyst synthesis, eliminates the need for high-toxicity reagents, and enhances the efficiency and selectivity of ethylene oligomerization, making it more suitable for industrial applications.
Implementation Method 1
an N ortho hydroxyl substituted nitrogen-containing compound is obtained in a substituted or unsubstituted nitrobenzene Ph′NO2 to generate the N ortho acyl substituted nitrogen-containing heterocyclic compound
Data Source
AI summary
Provided are a process for preparing an N ortho acyl substituted nitrogen-containing heterocyclic compound and an aminal iron (II) complex thereof, and the use of the complexes obtained by the process in an olefin oligomerization catalyst. The N ortho acyl substituted nitrogen-containing heterocyclic compound in the present invention is for example 2-acyl-1,10-phenanthroline or 2,6-diacetyl pyridine as shown in formula b, and the N ortho acyl substituted nitrogen-containing heterocyclic compound in the present invention is produced by a reaction of a precursor thereof in a substituted or unsubstituted nitrobenzene. Preferably the precursor shown in formula I in the present invention is produced by 1,10-phenanthroline reacting with trialkyl aluminum, or a halogenoalkyl aluminum RnAIXm, or a substituted or unsubstituted benzyl lithium Ph′CH2Li, followed by hydrolysis. The preparation method provided in the present invention has a few synthetic steps, an easy process, a low toxic effect, and reduces the preparation costs of the catalyst, and has a promising outlook in the industrial application.