Cedrene Diol Synthesis via One-Pot Oxidation
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Solution Overview
Problem
The existing methods for producing cis-cedrene diol from cedrene result in low yields and are not economically viable, with by-products such as cedralone forming during the process, limiting the efficiency of the two-step oxidation process.
Innovation Solution
A method involving the use of alpha-cedrene in a solvent mixture of water and a protic solvent like tert-butanol or isopropanol, with the addition of potassium permanganate and a base, which significantly increases the yield of cis-cedrene diol to over 80% by preventing by-product formation and facilitating the cleavage of the manganese-cedrene complex.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cedrene is oxidized to cedrene epoxide and then opened to diol in a two-step process, then the production of cis-cedrene diol can be achieved, but by-products such as cedralone and trans-cedrene diol are formed, reducing the yield
Solution Approach 1:
The patent combines the oxidation and epoxide opening steps into a single one-pot reaction. Potassium permanganate oxidizes cedrene directly to cis-cedrene diol in one step, eliminating the intermediate epoxide stage and preventing by-product formation that occurs during separate steps.
Solution Approach 2:
The patent changes the reaction conditions by using a basic environment (adding base) during the oxidation process. This parameter change prevents the formation of cedralone and other by-products while maintaining high yield of the desired cis-cedrene diol product.
2Productivity
If potassium permanganate is used to oxidize cedrene in aqueous acetone, then cedrene diol can be produced, but the yield is only 12-15%, making the method not suitable for economical synthesis
Solution Approach 1:
The patent changes the solvent system from aqueous acetone to a mixture of water and a protic solvent (such as tert-butanol or isopropanol). This parameter change in the solvent system enables the reaction to proceed with high yield (over 80%) while maintaining economic viability through simplified purification processes.
Solution Approach 2:
The patent introduces a base as an intermediary substance that facilitates the oxidation reaction. The base mediates between the oxidant (potassium permanganate) and the substrate (cedrene), enabling high-yield production of cis-cedrene diol while preventing unwanted side reactions.
3Productivity
If a protic solvent mixture is used with potassium permanganate and base, then the yield of cis-cedrene diol increases to over 80%, but the reaction mixture requires additional purification steps
Solution Approach 1:
The patent employs extraction as a purification method to separate the desired cis-cedrene diol from the reaction mixture. By using an appropriate extraction solvent, the diol can be selectively extracted from the aqueous-protic solvent mixture, simplifying the purification process while maintaining high yield.
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 method achieves high yields of cis-cedrene diol, up to 90%, while minimizing by-product formation, and allows for economic production by optimizing reaction conditions and solvent selection, ensuring stability and purity of the final product.
Implementation Method 1
Cedrene is oxidized to cedrene epoxide and this epoxide is then opened to the diol. The oxidation of cedrene with potassium permanganate to cedrene diol
Implementation Method 2
the base favors the formation of the diol because it accelerates the cleavage of the manganese from the manganese-cedrene diol complex
Implementation Method 3
providing alpha-cedrene in a solvent comprising or consisting of water and at least one further protic solvent
Implementation Method 4
extracting the resulting cis-cedrene diol from the reaction mixture of step iii)
Data Source
AI summary
The present invention relates to a method of preparing cis-cedrene diol comprising providing alpha-cedrene in a solvent comprising or consisting of water and at least one further protic solvent, adding potassium permanganate and a base and, optionally, removing the further protic solvent from the reaction mixture.