Triazine Intermediate Synthesis to Minimize UV Absorber Impurities
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing processes for synthesizing triazine-based UV absorbers result in the formation of impurities that are difficult to separate, leading to undesired products.
Innovation Solution
A novel process involving the reaction of 4,6-dichloro-1,3,5-triazin-2-amine with an aromatic compound in the presence of an acid to form 4,6-diaryl-1,3,5-triazin-2-amine, which can be converted into desired UV absorber compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional processes are used to synthesize 2-chloro-4,6-bisaryl-1,3,5-triazine, then the synthesis can be completed, but impurities are formed that are difficult to separate
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by using different reagents (4,6-dichloro-1,3,5-triazin-2-amine instead of 2-amino-4,6-dichloro-1,3,5-triazine) and modifying reaction conditions (solvent system, temperature, catalyst) to achieve cleaner reaction pathways that minimize impurity formation while maintaining synthesis efficiency
Solution Approach 2:
The patent removes the problematic chloro group from the final intermediate structure by using 4,6-dichloro-1,3,5-triazin-2-amine as starting material, which already has the amino group in place. This eliminates the need for subsequent chlorination steps that generate difficult-to-separate impurities, effectively extracting the source of contamination from the synthesis pathway
2Productivity
If impurities are formed during synthesis, then the reaction proceeds, but undesired products are formed in subsequent steps
Solution Approach 1:
The patent applies preliminary anti-action by designing a synthesis route that prevents impurity formation at the source rather than dealing with them later. By using 4,6-dichloro-1,3,5-triazin-2-amine as the starting material, the reaction pathway is designed to avoid the formation of problematic intermediates that would lead to undesired products in subsequent arylation steps
Solution Approach 2:
The patent segments the synthesis into cleaner, more controlled stages by first forming the 4,6-diaryl-1,3,5-triazin-2-amine intermediate with high purity through the modified reaction, which then serves as a clean substrate for subsequent functionalization steps, preventing error propagation through the synthesis sequence
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 minimizes the formation of impurities, providing a more efficient and purer synthesis of triazine intermediates for UV absorbers.
Implementation Method 1
reacting 4,6-dichloro-1,3,5-triazin-2-amine with at least one aromatic compound in the presence of at least one acid allowed the formation 4,6-diaryl-1,3,5-triazin-2-amine
Data Source
AI summary
The presently claimed invention relates to a novel, highly efficient and general process for the preparation of the triazine intermediates and their use in the preparation of UV absorbers.