Asymmetric Polyol-Ether Synthesis via Cyclic Acetal Hydrogenation
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Solution Overview
Problem
Current methods for producing polyol-ether compounds with multiple hydroxyl groups and an ether bond face challenges such as high reactivity of raw materials, low selectivity, and the inability to independently produce di-trimethylolpropane and di-pentaerythritol, limiting the flexibility in hydroxyl group arrangement and symmetry for various applications.
Innovation Solution
A method involving the hydrogenation reduction of specific cyclic acetal compounds in the presence of a hydrogenation catalyst, specifically using a solid catalyst containing palladium or zirconium compounds, to efficiently produce polyol-ether compounds with asymmetric structures and adjustable hydroxyl group distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxetane compound is used as raw material for producing polyol-ether compound, then the polyol-ether compound can be obtained through condensation reaction, but the oxetane compound has high reactivity causing secondary reactions and low reaction selectivity
Solution Approach 1:
The patent changes the chemical parameters of the raw material from oxetane compound to cyclic acetal compound, which has lower reactivity and prevents secondary reactions. This parameter change maintains production efficiency while significantly improving reaction selectivity and reducing harmful secondary reactions.
Solution Approach 2:
The patent uses readily available cyclic acetal compounds as raw materials instead of expensive oxetane compounds. The cyclic acetal compound serves as a disposable starting material that can be easily obtained and converted, reducing both cost and reactivity-related problems.
2Quantity of substance
If di-trimethylolpropane and di-pentaerythritol are produced from manufacturing plants, then these compounds can be obtained as by-products, but they cannot be singly produced and have symmetrical dimerized structures limiting flexibility
Solution Approach 1:
The patent introduces asymmetric polyol-ether compounds with non-symmetrical structures. By using cyclic acetal compounds with different substituent patterns (R1 and R3 groups), the invention produces molecules with asymmetric hydroxyl group arrangements, enabling versatile applications requiring specific polarity and symmetry characteristics.
Solution Approach 2:
The patent creates molecules with different local properties by varying the substituent groups (R1 and R3) at specific positions. This allows tailoring of local hydroxyl group distribution and polarity in different regions of the molecule, providing flexibility for specific applications while maintaining overall molecular structure.
3Adaptability or versatility
If neopentyl glycol-trimethylolpropane ether is synthesized with three primary hydroxyl groups in 1:2 ratio, then the compound can be used for synthesizing branched polymer compounds, but it is difficult to achieve higher distribution ratios for highly branched polymers
Solution Approach 1:
The patent changes the hydroxyl group distribution parameter by selecting different cyclic acetal compounds as raw materials. By choosing cyclic acetals with specific substituent ratios, the invention can produce polyol-ether compounds with various hydroxyl group distribution ratios, including higher ratios that enable more efficient synthesis of highly branched polymer compounds.
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 method allows for the efficient production of polyol-ether compounds with asymmetric structures, enabling the synthesis of highly branched polymer compounds and offering flexibility in hydroxyl group arrangement, thus addressing the limitations of existing methods.
Implementation Method 1
a compound represented by the following formula (1) is subjected to hydrogenation reduction in the presence of a hydrogenation catalyst to obtain a polyol-ether compound
Implementation Method 2
in the presence of a hydrogenation catalyst, specifically using a solid catalyst containing palladium or zirconium compounds
Data Source
AI summary
A method for producing a polyol-ether compound, wherein a compound represented by the following formula (1) is subjected to hydrogenation reduction in the presence of a hydrogenation catalyst to obtain a polyol-ether compound having a skeleton represented by the following formula (2): wherein R1 and R2, which may be the same as or different from each other, each represent a linear or branched alkyl group having 1 to 6 carbon atoms; and R3 represents a linear or branched alkyl group having 1 to 6 carbon atoms or a hydroxymethyl group.