17-Methylalkane Synthesis via Distillable Halo Intermediate
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Solution Overview
Problem
Existing processes for synthesizing 17-methylpentatriacontane and 17-methylheptatriacontane are not industrially practical due to the use of toxic solvents like benzene and flammable materials like palladium on carbon, and purification by column chromatography is difficult to scale up, leading to low yields and environmental concerns.
Innovation Solution
A novel process using a 1-halo-7-methyltricosane compound as a synthetic intermediate, which can be purified by distillation and prepared through coupling reactions with nucleophilic and electrophilic reagents, allowing for high-yield production of 17-methylalkane compounds with reduced environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If column chromatography is used for purification, then high purity products are obtained, but the process cannot be scaled up for industrial production
Solution Approach 1:
The patent changes the purification parameter from column chromatography to distillation, which is suitable for industrial scaling. By adjusting the purification method parameter, the process achieves both high purity (98% or higher) and industrial scalability, resolving the contradiction between purification quality and productivity.
2Productivity
If benzene is used as solvent, then the dehydration reaction proceeds effectively, but toxic environmental impact occurs
Solution Approach 1:
The patent replaces toxic benzene with water as the solvent medium. Water is environmentally benign and can be easily disposed of, eliminating the toxic environmental impact while maintaining reaction effectiveness through the use of solid acid catalysts that enable dehydration in aqueous media.
Solution Approach 2:
The patent creates an inert environmental condition by using water as a non-toxic, non-flammable solvent alternative to benzene. This inert environment approach eliminates harmful effects while maintaining the necessary reaction conditions through catalyst selection.
3Productivity
If palladium on carbon is used for hydrogenation, then the reaction proceeds effectively, but fire hazard increases due to flammability
Solution Approach 1:
The patent replaces expensive and hazardous palladium on carbon with inexpensive nickel catalyst that can be easily disposed of. Nickel is less expensive, less hazardous, and maintains catalytic effectiveness for the hydrogenation reaction, eliminating fire hazards while preserving productivity.
Solution Approach 2:
The patent substitutes the mechanical/catalytic system of palladium on carbon with a nickel-based catalytic system. This substitution maintains the chemical function of hydrogenation while eliminating the safety hazards associated with palladium on carbon and diethyl ether.
4Productivity
If diethyl ether is used as solvent, then the hydrogenation reaction proceeds effectively, but handling difficulty increases due to flammability
Solution Approach 1:
The patent replaces flammable diethyl ether with water as the solvent. Water is non-flammable, inexpensive, and easily handled, eliminating safety concerns and handling difficulties while maintaining reaction effectiveness through the use of appropriate catalysts.
Solution Approach 2:
The patent creates a safe inert environment by using water instead of flammable diethyl ether. This eliminates fire hazards and simplifies handling operations while maintaining the necessary reaction conditions through catalyst selection and reaction parameter optimization.
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 process achieves efficient and economical synthesis of 17-methylalkane compounds with high yields, easy handling, and minimal environmental impact by using liquid starting materials and intermediates, enabling scalable purification through distillation.
Implementation Method 1
converting a nucleophilic reagent, 7-methyltricosyl compound, into a 17-methylalkane compound by subjecting the nucleophilic reagent to a coupling reaction with an electrophilic alkyl reagent
Implementation Method 2
which can be purified by distillation
Data Source
AI summary
The present invention relates to a 1-halo-7-methyltricosane compound of the following general formula (1), wherein X1 represents a halogen atom. The present invention relates also to a process for preparing a 17-methylalkane compound of the following general formula (4), wherein n represents an integer of 11 to 13, the process comprising the steps of converting the aforesaid 1-halo-7-methyltricosane compound (1) into a nucleophilic reagent, 7-methyltricosyl compound, of the following general formula (2), wherein M1 represents Li, MgZ1, CuZ1, or CuLiZ1, and Z1 represents a halogen atom or a 7-methyltricosyl group, subsequently subjecting the aforesaid nucleophilic reagent, 7-methyltricosyl compound (2), to a coupling reaction with an electrophilic alkyl reagent of the following general formula (3), wherein X2 represents a halogen atom or a p-toluenesulfonyloxy group, and n is as defined above, to form the aforesaid 17-methylalkane compound (4).