Solid-Supported Catalyst Synthesis of Hindered Amine Light Stabilizers
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Solution Overview
Problem
Current methods for synthesizing N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,3-benzenedicarboxamide face challenges such as environmental pollution and low yield due to the use of acyl chloride compounds, which complicates industrial production and increases costs.
Innovation Solution
A novel synthesis method using a solid-supported catalyst prepared by treating a KIT-1 molecular sieve with water vapor and nitric acid, followed by impregnation with nickel and lanthanum ions, reacts compounds of formula (I) and (II) in an organic solvent to produce the desired product with improved yield and reduced pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If m-phthaloyl chloride is used as a raw material in the synthesis method, then the desired product can be obtained, but serious environmental pollution is caused and subsequent treatment is extremely complicated
Solution Approach 1:
The patent extracts and removes the harmful acyl chloride group from the synthesis pathway by replacing m-phthaloyl chloride with dimethyl isophthalate, thereby eliminating the source of serious environmental pollution while maintaining the core reaction functionality through ester group substitution
Solution Approach 2:
The patent converts the potentially harmful acyl chloride reaction pathway into a beneficial ester-based synthesis route that produces minimal waste and eliminates the need for complex subsequent treatment, turning a polluting process into an environmentally friendly one
2Object-affected harmful factors
If dialkyl phthalate is used to replace m-phthaloyl chloride, then environmental pollution is reduced and subsequent treatment difficulty is decreased, but the yield is only about 90% and there is room for improvement
Solution Approach 1:
The patent optimizes reaction parameters including temperature control, catalyst selection, and reaction time to improve the yield from 90% to over 95%, while maintaining the environmentally friendly ester-based synthesis pathway established by using dialkyl isophthalate
3Ease of manufacture
If acyl chloride compounds are used in the synthesis process, then the reaction can proceed, but production costs increase and industrial production becomes difficult to achieve
Solution Approach 1:
The patent employs dimethyl isophthalate as a stable, easy-to-handle, and cost-effective raw material that replaces expensive and difficult-to-manage acyl chloride compounds, making the synthesis process more suitable for large-scale industrial production with reduced safety concerns and lower operational costs
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 method achieves a high yield of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,3-benzenedicarboxamide with excellent cycling stability and reactivity, reducing environmental impact and production costs, offering better industrial prospects.
Implementation Method 1
a compound of the formula (I) and a compound of the formula (II) react under stirring in an organic solvent in the presence of a solid supported catalyst
Implementation Method 2
treating a KIT-1 molecular sieve with water vapor and nitric acid, followed by impregnation with nickel and lanthanum ions
Data Source
AI summary
The present invention relates to a method for synthesizing N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,3-benzenedicarboxamide as shown in the following formula (III),comprising the following steps that a compound of the following formula (I) and a compound of the following formula (II) react under stirring in an organic solvent in the presence of a solid supported catalyst, and after the completion of the reaction, a compound of the formula (III) is obtained by post-treatment,wherein R1 to R2 are each the same or different selected from C1-6 alkyl. The method can achieve good technical effects through the use of a unique catalyst and the compounding of the organic solvent, has the advantages of reduced pollution, good environment and significant improvement on yield compared with the prior art, can provide more inexpensive functional additives for the field of plastic processing, and has good industrial production prospects and application potential.