Bis(hydroxymethyl)cyclohexane Ether Synthesis for Fragrance Purity
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Solution Overview
Problem
The challenge lies in finding novel bis(hydroxymethyl)cyclohexane derivatives with specific sensory properties, such as fruity notes, that can be synthesized directly with minimal secondary components and easy purification, to serve as effective fragrances and formulation auxiliaries in cosmetics and detergents, where natural fragrances are costly and variable.
Innovation Solution
The development of 1,2-bis(ethoxymethyl)cyclohexane with a trans/cis ratio of at least 70/30, and a process involving alkenylation of alcohol groups with alkynes followed by reduction of alkenyl ether groups to produce alkyl ethers, allowing for direct synthesis and purification in successive steps, is disclosed for use as fragrances, flavors, and formulation auxiliaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct synthesis of bis(hydroxymethyl)cyclohexane derivatives is performed, then productivity and manufacturing precision are improved, but purification difficulty increases due to potential by-products
Solution Approach 1:
The patent converts the potentially harmful effect of by-product formation into a beneficial outcome by designing a synthesis route where the main reaction produces the desired ether product directly with minimal by-products. The alkenylation followed by reduction sequence is specifically chosen to give high selectivity, transforming what could be a purification problem into a straightforward isolation process.
Solution Approach 2:
The patent employs parameter changes by controlling the alkenylation reaction conditions (base selection, temperature, solvent) and subsequent reduction parameters (hydrogen pressure, catalyst type) to optimize the reaction pathway. This ensures high conversion to the desired ether product while minimizing side reactions, thereby simplifying purification.
2Reliability
If natural fragrances are used, then sensory properties are improved, but cost and availability variability worsen
Solution Approach 1:
The patent creates synthetic copies of natural fragrance compounds by synthesizing bis(hydroxymethyl)cyclohexane derivatives that replicate the sensory properties of natural fragrances. These synthetic analogs provide consistent odor profiles without the cost and availability issues of natural extraction, effectively copying the beneficial sensory characteristics while eliminating the drawbacks.
Solution Approach 2:
The patent replaces expensive, limited natural fragrance resources with inexpensive, readily available synthetic compounds. The synthesized ethers provide comparable or superior sensory properties at lower cost and with consistent supply, making the fragrance industry less dependent on variable natural sources.
3Adaptability or versatility
If chemical structure is modified to find new fragrances, then sensory property diversity is improved, but search difficulty and time increase
Solution Approach 1:
The patent applies preliminary action by establishing a reliable synthetic route to bis(hydroxymethyl)cyclohexane derivatives before attempting sensory optimization. The developed alkenylation-reduction sequence provides a ready-to-use platform that can be quickly adapted to produce various ether derivatives, eliminating the need to develop new synthesis methods for each fragrance candidate.
Solution Approach 2:
The patent uses parameter changes systematically by modifying the ether substituent groups (methyl, ethyl, propyl, etc.) on the cyclohexane core structure to explore different sensory properties. This structured approach to molecular variation allows efficient screening of fragrance candidates with predictable changes in odor characteristics.
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
This approach enables the production of high-purity, odor-intensive cyclohexane derivatives with enhanced sensory properties, suitable for perfumes and detergents, offering improved efficiency and reduced toxicity, while minimizing by-products and simplifying the purification process.
Implementation Method 1
alkenylation of alcohol groups with alkynes followed by reduction of alkenyl ether groups
Implementation Method 2
reduction of alkenyl ether groups to give the corresponding alkyl ethers
Data Source
AI summary
The present invention relates to ethers of 1,2-, 1,3-and 1,4-bis(hydroxymethyl)cyclohexanes, to the preparation of such ethers and also to the use of such ethers as fragrances and as formulation auxiliaries in fragrance-comprising preparations.