Two-Step 7,8-Dihydro-C15-Aldehyde Synthesis via Catalytic Rearrangement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing 7,8-dihydro-C 15 -aldehyde require a three-step process, which is inefficient and generates more waste and energy compared to the desired two-step process.
Innovation Solution
A two-step process involving ethynylation of dihydro-β-ionone followed by a Meyer-Schuster rearrangement using a transition metal-based catalyst, such as Vanadium-based catalysts, under specific temperature and solvent conditions, reduces waste and energy consumption while improving yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a three-step process is used to produce 7,8-dihydro-C15-aldehyde, then the production can be achieved with conventional methods, but the process efficiency is lower and more waste is generated
Solution Approach 1:
The patent combines two separate reaction steps (ethynylation and Meyer-Schuster rearrangement) into a continuous two-step process, eliminating the need for intermediate isolation and purification. This merging of operations reduces the total number of steps from three to two, thereby improving productivity and reducing waste from multiple workup and purification cycles.
Solution Approach 2:
The patent implements a continuous process where the ethynylation reaction directly feeds into the Meyer-Schuster rearrangement without interrupting the reaction flow. The crude product from ethynylation is immediately subjected to rearrangement conditions, maintaining continuous useful action and eliminating idle time between steps, thus improving overall productivity and reducing waste.
2Ease of manufacture
If a three-step process is used, then conventional production methods can be maintained, but energy consumption increases
Solution Approach 1:
By merging the ethynylation and Meyer-Schuster rearrangement into a streamlined two-step sequence, the patent eliminates redundant heating, cooling, and purification cycles that would be required in a three-step process. This reduces cumulative energy consumption while maintaining ease of manufacture through a still-simple procedural framework.
Solution Approach 2:
The continuous flow from ethynylation directly to Meyer-Schuster rearrangement eliminates the energy-intensive intermediate isolation and re-dissolution steps required in conventional three-step processes. The reaction mixture proceeds directly from one transformation to the next, maintaining thermal and operational continuity that significantly reduces energy consumption.
3Reliability
If stoichiometric amounts of reagents are used in ethynylation, then the reaction can proceed to completion, but more waste is generated
Solution Approach 1:
The patent changes the reagent stoichiometry from traditional stoichiometric amounts to catalytic amounts (e.g., using catalytic bases like DBU or Cs2CO3 instead of stoichiometric organometallic reagents). This parameter change maintains reliable reaction completion through catalytic cycles while dramatically reducing reagent waste and improving atom economy.
Solution Approach 2:
The patent replaces expensive, stoichiometric organometallic reagents with cheaper, catalytic amounts of organic bases or inorganic carbonates. These catalytic reagents can be used in small amounts and regenerated through the reaction cycle, reducing both waste and cost while maintaining reliable product formation.
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
The new process achieves higher yields with reduced energy costs and easier purification, offering a more efficient and environmentally friendly method for producing 7,8-dihydro-C 15 -aldehyde compared to traditional three-step procedures.
Implementation Method 1
the rearrangement (step (2)) is carried out by using at least one transition metal-based catalyst
Implementation Method 2
step (1) is carried out by a catalytic reaction step as following wherein R is K or Cs
Data Source
AI summary
The present invention relates to a new method to produce 7,8-dihydro-C15- aldehyde.