Optically Active Ester Compounds for Enhanced Fragrance Effects
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Solution Overview
Problem
The fragrance industry faces challenges in developing cost-effective processes to synthesize enantiomers and targeted racemic compounds with desirable fragrance effects, as existing methods often fail to produce a stronger fragrance effect than their racemic mixtures, and there is a need for new chiral compounds to create unique perfumes and personal care products.
Innovation Solution
The development of optically active ester compounds with a newly identified chiral center at the carbon 1' position, represented by Formulas I, II, IV, and V, which are used to enhance fragrance formulations by incorporating an olfactory acceptable amount of these compounds, specifically the (+)-(1S, 1'R)-1-(3',3'-dimethyl-1'-cyclohexyl)ethyl ethyl malonate, known for its powerful musky, fruity, woody, and ambery notes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If racemic mixtures are used in fragrance formulations, then the fragrance effect is weaker, but the synthesis process is simpler and more cost-effective
Solution Approach 1:
The patent applies asymmetry by introducing a newly identified chiral center at the carbon 1' position in the cyclohexyl ring, creating optically active ester compounds with specific enantiomeric configurations (1S,1'R and 1R,1'S). This asymmetric structural modification results in enhanced fragrance effects compared to racemic mixtures, directly resolving the contradiction between fragrance effectiveness and synthesis complexity by providing a structurally asymmetric compound that delivers superior olfactory performance
Solution Approach 2:
The patent changes the stereochemical parameters of the fragrance compounds by specifying particular enantiomeric forms at the newly identified chiral center. By controlling the optical configuration (R or S) at carbon 1' position while maintaining the known chiral center at carbon 1 position, the patent achieves enhanced fragrance effects. This parameter change approach allows for targeted synthesis of specific enantiomers that exhibit stronger and more desirable fragrance characteristics than racemic mixtures
2Adaptability or versatility
If new chiral compounds are developed to create unique fragrances, then the fragrance diversity is improved, but the development cost and time increase
Solution Approach 1:
The patent performs preliminary action by identifying and characterizing the previously unknown chiral center at carbon 1' position before attempting to synthesize new fragrance compounds. By establishing the stereochemical framework and optical activity requirements in advance, the patent enables more efficient development of enantiomerically pure fragrance compounds. This preliminary structural analysis prevents wasted effort in synthesizing inactive or less effective enantiomeric forms, thereby reducing overall development time while maintaining fragrance diversity
Solution Approach 2:
The patent segments the fragrance development process by treating the two chiral centers (carbon 1 and carbon 1') as independent but interacting elements. By separately analyzing and controlling the stereochemistry at each center, the patent can systematically explore different enantiomeric combinations (1R,1'R; 1S,1'S; 1R,1'S; 1S,1'R) to create diverse fragrance profiles. This segmented approach to stereochemical control enables efficient generation of fragrance diversity without requiring complete rediscovery of each compound's properties
Data Source
AI summary
Optically active ester compounds of the formula: in particular, are useful fragrance materials.