Difluoro Chelato Borate Synthesis via Second Boron Source
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Solution Overview
Problem
Existing processes for synthesizing difluoro chelato borate salts are inefficient due to incomplete conversion of fluorine-containing educts, leading to unfavorable losses and the generation of unwanted by-products, requiring expensive and difficult-to-handle intermediates like lithium alkoxides and SiCl4.
Innovation Solution
A process involving the reaction of BF3 sources with dihydric compounds and boron sources that do not contain fluorine, which efficiently converts fluorine into difluoro chelato borate, reducing by-product formation and eliminating the need for intermediate steps and expensive reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional synthesis methods using BF3 or tetrafluoroborate salts are used, then difluoro chelato borate salts can be produced, but fluorine conversion is incomplete leading to unfavorable fluorine loss and by-product generation
Solution Approach 1:
The patent introduces a second boron source as an intermediary substance that mediates the reaction between BF3 and the dihydric compound. This intermediary boron source accepts fluorine atoms that would otherwise be lost as by-products, channeling them into the desired difluoro chelato borate product and improving fluorine conversion efficiency.
Solution Approach 2:
The patent changes the compositional parameters of the reaction system by adding a second boron source, which alters the reaction pathway and improves fluorine utilization. This parameter change transforms the reaction from one with incomplete fluorine conversion to one with high fluorine efficiency.
2Ease of manufacture
If conventional synthesis methods are used, then difluoro chelato borate salts can be produced, but fluorine containing by-products are generated requiring removal
Solution Approach 1:
The patent converts the potentially harmful fluorine by-products into beneficial product material by introducing a second boron source that captures the excess fluorine and incorporates it into additional difluoro chelato borate molecules, transforming waste into useful product.
3Productivity
If intermediates like lithium alkoxides, tetrafluoroborate salts and SiCl4 are used, then synthesis can proceed, but additional synthesis steps are required and handling becomes difficult
Solution Approach 1:
The patent extracts and eliminates the problematic intermediate steps involving lithium alkoxides, tetrafluoroborate salts, and SiCl4 from the synthesis pathway. By using readily available boron sources instead, the method removes the complex intermediate preparation steps while maintaining synthesis efficiency.
Solution Approach 2:
The patent segments the synthesis process into simpler, more manageable steps by avoiding complex intermediates. The direct reaction approach divides the process into essential steps only, reducing overall process complexity while maintaining productivity.
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 yields of difluoro chelato borates with reduced by-product generation, using readily accessible and cost-effective reagents, and avoids the need for special equipment or measures, resulting in a more efficient and simplified synthesis.
Implementation Method 1
reacting (i) one or more BF3 sources; (b) a dihydric compound selected from 1,2-, 1,3- and 1,4-diols, 1,2-, 1,3- and 1,4-dicarboxylic acids, and 1,2-, 1,3- and 1,4-hydroxycarboxylic acids; (c) one or more second boron sources which do not contain F
Data Source
AI summary
A process for preparing a difluoro chelato borate salt comprising an anion A of formula (I)whereinis a bidentate radical derived from a 1,2-, 1,3- or 1,4-diol, from a 1,2-, 1,3- or 1,4-dicarboxylic acid or from a 1,2-, 1,3- or 1,4-hydroxycarboxylic acid by abstracting the two H atoms of pairs of adjacent OH groups of the respective diol, hydroxycarboxylic acid or dicarboxylic acid. The process includes step (i) reacting (a) one or more BF3 sources; (b) a dihydric compound selected from 1,2-, 1,3- and 1,4-diols, 1,2-, 1,3- and 1,4-dicarboxylic acids, and 1,2-, 1,3- and 1,4-hydroxycarboxylic acids; (c) one or more second boron sources which do not contain F; and (d) one or more proton acceptors.