Timberone Synthesis via Citral Aldolization and Cyclization
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Solution Overview
Problem
The existing process for preparing timberone, a fragrance compound, relies on β-cyclocitral, which is expensive and not readily available, necessitating a more economical and efficient alternative using cheaper raw materials.
Innovation Solution
A three-step process utilizing citral as a starting material, involving aldolization with 2-pentanone, cyclization in the presence of an acid, and hydrogenation with Pt or Pd catalysts to produce timberone, allowing for high overall yield and flexibility in stereoisomer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing process using β-cyclocitral is employed, then timberone can be prepared with established methodology, but the raw material cost is high and availability is limited
Solution Approach 1:
The patent replaces expensive β-cyclocitral with cheap citral as the starting material. Citral is a readily available, low-cost raw material that can be easily obtained from natural sources or synthesized, thus resolving the contradiction between reliability of methodology and availability/cost of raw materials
Solution Approach 2:
The patent changes the chemical starting material from β-cyclocitral to citral, fundamentally altering the reaction pathway parameters while maintaining the ability to produce timberone. This parameter change enables use of cheaper, more available raw materials without sacrificing the ability to produce the desired product
2Productivity
If a three-step process is used to prepare timberone from citral, then the overall yield is high and cost is reduced, but the process complexity increases
Solution Approach 1:
The patent divides the synthesis of timberone into three distinct sequential steps: (a) aldolization of citral with 2-pentanone to form an intermediate, (b) cyclization to form the cyclohexane ring structure, and (c) hydrogenation to produce final timberone product. This segmentation allows each step to be optimized independently while achieving high overall yield
Solution Approach 2:
The patent employs a continuous three-step process where each reaction step flows into the next without interruption. The intermediate products from each step are directly used in the subsequent step, maintaining continuous useful action and maximizing overall productivity while the modular nature manages complexity
3Productivity
If hydrogenation is performed with Pt or Pd catalysts, then quantitative yields are achieved at room temperature and low pressure, but catalyst cost and handling complexity increase
Solution Approach 1:
The patent uses inexpensive Pt or Pd catalysts that can be easily handled and disposed of after use. These catalysts provide quantitative yields under mild conditions (room temperature and low pressure), and their low cost and simplicity offset the increased handling requirements, resolving the contradiction between productivity and handling complexity
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 provides an efficient and cost-effective method for producing timberone with high yields and the ability to produce stereochemically pure or mixed stereoisomers, overcoming the limitations of the traditional method by using readily available citral and achieving quantitative yields at room temperature and low pressure.
Implementation Method 1
reacting citral with a 2-pentanone in the presence of an aldolization catalyst to produce 8,12-dimethyl-5,7,11-tridecatrien-4-one
Implementation Method 2
cyclization of 8,12-dimethyl-5,7,11-tridecatrien-4-one in the presence of an acid to 1-(2,6,6-trimethylcyclohex-2-en-1-yl)-1-hexen-3-one and/or 1-(2,6,6-trimethylcyclohex-1-en-1-yl)-1-hexen-3-one
Implementation Method 3
hydrogenation of 1-(2,6,6-trimethylcyclohex-2-en-1-yl)-1-hexen-3-one and/or 1-(2,6,6-trimethylcyclohex-1-en-1-yl)-1-hexen-3-one in the presence of Pt and /or Pd catalyst to timberone
Data Source
AI summary
This invention relates to a novel process for the preparation of timberone useful for perfume or cosmetics.