Alpha-Damascone Synthesis via Mild Oxidation and In Situ Isomerization
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Solution Overview
Problem
Current synthetic processes for producing α-damascone from citral suffer from low yields due to the formation of side products when using strong oxidants and require additional isomerization steps, making them unsuitable for technical-scale production.
Innovation Solution
A process involving the oxidation of 6,10-dimethylundeca-1,5,9-trien-4-ol with an oxidizing agent in the presence of organic nitroxyl radicals, nitrate compounds, and inorganic solids, followed by cyclization and in situ isomerization using an acid, to produce α-damascone in high yields under mild reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If strong oxidants are used to oxidize allylic alcohol intermediates, then oxidation efficiency is improved, but side product formation increases and yield decreases
Solution Approach 1:
The patent changes the chemical parameters of the oxidation system by using mild oxidants (molecular oxygen, hydrogen peroxide, or sodium hypochlorite) instead of strong oxidants, and adjusts the reaction conditions (temperature, catalyst composition) to achieve both high oxidation efficiency and high yield by minimizing side product formation
Solution Approach 2:
The patent introduces catalytic intermediaries (nitroxyl radicals like TEMPO, iron salts, and inorganic solids) that mediate the oxidation process, enabling the use of mild oxidants to achieve efficient oxidation without the harsh conditions that cause side product formation
2Manufacturing precision
If additional isomerization steps are added to the synthesis process, then product purity is improved, but process complexity and production time increase
Solution Approach 1:
The patent merges the oxidation step with the isomerization step into a single integrated process, where the oxidation of allylic alcohol to α-damascone occurs concurrently with the isomerization of β-damascone to α-damascone, eliminating the need for separate purification steps and reducing process complexity
Solution Approach 2:
The patent establishes a continuous process where the oxidation reaction proceeds while the isomerization occurs simultaneously in the same reaction medium, maintaining continuous transformation of intermediates to final product without interruption or additional processing steps
3Manufacturing precision
If mild oxidants are used to reduce side product formation, then yield is improved, but reaction time increases
Solution Approach 1:
The patent uses catalytic intermediaries (nitroxyl radicals, iron salts, inorganic solids) that accelerate the oxidation reaction rate, allowing mild oxidants to achieve both high yield and reasonable reaction time by providing an efficient catalytic pathway
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 process achieves high space-time yields and reduces by-product formation, allowing for efficient and economic production of α-damascone on industrial scales without the use of expensive or hazardous reagents.
Implementation Method 1
oxidizing 6,10-dimethylundeca-1,5,9-trien-4-ol with an oxidizing agent to 6,10-dimethylundeca-1,5,9-trien-4-one
Implementation Method 2
reacting the 6,10-dimethylundeca-1,5,9-trien-4-one with an acid
Implementation Method 3
in situ isomerization using an acid
Data Source
AI summary
The present invention relates to a process for preparing 1-(2,6,6-trimethylcyclohex-2- en-1-yl)but-2-en-1-one, which comprises a) providing 6,10-dimethylundeca-1,5,9-trien-4-ol, b) oxidizing 6,10-dimethylundeca-1,5,9-trien-4-ol provided in step a) with an oxidizing agent in the presence of at least one organic nitroxyl radical, at least one nitrate compound and an inorganic solid to yield 6,10-dimethylundeca-1,5,9- trien-4-one, c) reacting the 6,10-dimethylundeca-1,5,9-trien-4-one obtained in step b) with an acid to yield 1-(2,6,6-trimethylcyclohex-2-en-1-yl)but-2-en-1-one.