5-Methyl-1H-Tetrazole Synthesis Yield and Purity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for producing methyl tetrazole result in low yields, particularly for shorter alkyl substituents, making it difficult to obtain the product in high yield or quantitative yield.
Innovation Solution
A method involving a reaction mixture of acetonitrile, an azide compound, and a Lewis acid compound in the presence of water, followed by extraction with ethyl acetate to produce high-purity 5-methyl-1H-tetrazole, with specific conditions such as controlled temperature and solvent amounts to enhance yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce methyl tetrazole, then the production process is simple, but the yield is low
Solution Approach 1:
The patent applies parameter changes by optimizing reaction conditions including using specific molar ratios of reactants (acetonitrile:azide compound = 2:1 to 10:1), controlling reaction temperature (0°C to 100°C), and adjusting solvent composition (water content 0-50 vol%). These parameter optimizations resolve the contradiction by achieving high yield (65-95%) through systematic parameter tuning while maintaining a relatively simple one-pot reaction process.
Solution Approach 2:
The patent introduces a Lewis acid compound as an intermediary catalyst to facilitate the reaction between acetonitrile and azide compound. The Lewis acid (such as ZnCl2, AlCl3, or FeCl3) acts as a mediator that activates the reactants and lowers the activation energy, enabling high yield production without requiring complex multi-step synthesis procedures.
2Productivity
If conventional methods are used to produce alkyl tetrazole with short alkyl substituents, then the production process is straightforward, but the yield decreases
Solution Approach 1:
The patent specifically addresses short alkyl substituent production by optimizing parameters including using excess acetonitrile (5:1 to 10:1 molar ratio), conducting the reaction at elevated temperatures (80°C to 100°C), and employing specific Lewis acids (ZnCl2, AlCl3). These parameter changes resolve the contradiction by achieving quantitative yield for methyl tetrazole while maintaining ease of manufacture through a single reaction step followed by simple extraction.
3Manufacturing precision
If extraction is performed multiple times with large amounts of ethyl acetate, then purity increases, but solvent consumption and cost increase
Solution Approach 1:
The patent applies extraction principles by using ethyl acetate to separate 5-methyl-1H-tetrazole from the reaction mixture. The optimization involves performing extraction 3-5 times with controlled amounts of ethyl acetate (1-9 ml per 1 mmol of azide compound), which achieves high purity (95-98%) while minimizing solvent consumption. The extract is then dried and concentrated to obtain the pure product.
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 method achieves high yields of 65% to 95% and high purity of 95% to 98% 5-methyl-1H-tetrazole, with further purification possible through recrystallization, effectively addressing the low yield issues of conventional methods.
Implementation Method 1
reacting a reaction mixture containing acetonitrile, an azide compound, a Lewis acid compound, and water
Implementation Method 2
obtaining solid 5-methyl-1H-tetrazole by extracting the concentrate 3 to 5 times using ethyl acetate
Implementation Method 3
drying the extract
Data Source
AI summary
The present invention provides a method for producing high-purity 5-methyl-1H-tetrazole in high yield.