Substituted Cyclic Enaminoketone Compounds for Broad-Spectrum UV Absorption
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Solution Overview
Problem
Current UV absorbing compounds, particularly those based on cyclic enaminoketone cores, have limited variance in absorbance maximum, primarily focusing on the UVB range with minimal broad-spectrum protection, lacking effective absorption in the UVA region and visible light spectrum.
Innovation Solution
Development of substituted cyclic enaminoketone compounds with varied groups that affect electron density and provide additional UV and visible light absorbance characteristics, extending the absorbance maximum into the UVA range and offering variance in absorption profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If substitution patterns around the cyclic enaminoketone core are limited to simple alkyl chains and carbonyl groups, then the compound structure is simple and easy to manufacture, but the absorbance maximum remains narrow and confined to the UVB range
Solution Approach 1:
The patent applies parameter changes by systematically varying substitution patterns at multiple positions (2-position with electron-donating groups, 6-position with aromatic/heteroaromatic groups, and N-substituents) to shift the absorbance maximum from UVB into the UVA range. This transforms the chemical structure parameters to achieve broader spectrum coverage while maintaining synthetic feasibility through established organic chemistry transformations.
Solution Approach 2:
The patent creates composite molecular structures by combining the cyclic enaminoketone core with various substituent groups (electron-donating groups at 2-position, aromatic groups at 6-position, and diverse N-substituents). This composite approach integrates multiple functional moieties into a single molecule to achieve both UVB and UVA protection, resolving the contradiction between structural simplicity and absorbance versatility.
2Device complexity
If only a single substitution with a methyl group is proposed at the 2-position of the enaminoketone ring, then the molecular structure remains simple, but the electron density modification and absorbance extension are insufficient
Solution Approach 1:
The patent applies local quality by placing specific electron-donating groups (methoxy, hydroxyl, amino, halogen) at the 2-position of the enaminoketone ring. This localized substitution strategically modifies electron density at a critical position to enhance conjugation and extend absorbance into the UVA range, achieving improved UV protection effectiveness without excessive molecular complexity.
3Stability of the object's composition
If no substitutions are made at the 6-position of the enaminoketone ring, then the compound structure is simple and stable, but the absorbance maximum cannot be extended into the UVA region
Solution Approach 1:
The patent applies universality by designing the 6-position substituent to serve multiple functions: aromatic and heteroaromatic groups provide both structural stability through resonance and extended conjugation for UVA absorbance. Groups like phenyl, naphthyl, pyridyl, and furanyl simultaneously maintain molecular stability and expand the absorbance spectrum, achieving dual benefits in one substitution.
4Ease of manufacture
If all compounds have a carbonyl group attached directly to the ring at the 3-position with straight chain alkyl substitutions, then the synthesis pathway is standardized and simple, but the variance in absorbance maximum is limited
Solution Approach 1:
The patent applies dynamics by introducing variability into the previously static 3-position substitution pattern. While maintaining the standardized carbonyl attachment for ease of synthesis, the patent now allows different alkyl chain lengths, branched alkyl groups, and even aromatic substitutions at this position. This dynamic approach enables precise control over absorbance maximum while retaining synthetic standardization through the common carbonyl linkage.
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 substituted cyclic enaminoketone compounds provide enhanced UV protection across the UV-A, UV-B, and visible light regions, addressing the limitations of existing compounds by offering broader spectrum coverage and improved stability, solubility, and molecular weight, thus enhancing protection for both human skin and materials.
Implementation Method 1
UV absorbing compounds, compositions comprising same and uses thereof - The compounds absorb electromagnetic radiation in the UV and visible regions
Data Source
AI summary
There is provided a range of novel compounds which have been demonstrated to have useful electromagnetic radiation absorbing properties. These compounds will find use in a range of applications such as active components in sunscreen formulations, paints, plastics, fabrics, glass and UV protective coatings.