Silanol Compound Production via Proton Exchange in DMSO
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Solution Overview
Problem
The synthesis of silanol compounds is challenging due to their instability in water and rapid condensation, making it difficult to produce them with good yield using traditional methods like the sol-gel process with alkoxysilanes or halogenated silanes.
Innovation Solution
A method involving proton exchange of a silicate with an acidic compound having an acid dissociation constant pKa between -1 to 20 in dimethyl sulfoxide (DMSO) to efficiently produce silanol compounds, suppressing side reactions and condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional sol-gel method using alkoxysilane or halogenated silane is used, then silanol compound can be synthesized, but the silanol condenses simultaneously with hydrolysis in the presence of water resulting in poor yield
Solution Approach 1:
The invention changes the key parameter of reaction medium from aqueous to non-aqueous (specifically using dimethyl sulfoxide or acetonitrile). This parameter change prevents water-induced condensation of silanol while still allowing hydrolysis and condensation to proceed through alternative mechanisms, thereby achieving high yield of stable silanol compounds
Solution Approach 2:
The invention introduces a specific base compound as an intermediary to facilitate the reaction. The base compound (with pKa of 15-35) acts as a mediator that promotes hydrolysis and condensation of siloxane while preventing unwanted side reactions, enabling high-yield silanol production in non-aqueous conditions
2Productivity
If silanol is synthesized in the presence of water, then hydrolysis proceeds, but silanol condenses rapidly resulting in difficulty to synthesize with good yield
Solution Approach 1:
The invention creates an inert non-aqueous environment using dimethyl sulfoxide or acetonitrile as the reaction medium. This inert atmosphere excludes water from the system, preventing water-induced condensation reactions and maintaining silanol stability throughout the synthesis process, thereby achieving both high yield and reliable product stability
3Productivity
If conventional methods are used to produce silanol, then production can proceed, but side reactions and condensation occur making efficient production difficult
Solution Approach 1:
The invention changes multiple parameters simultaneously: reaction medium (to non-aqueous), pH control (using base compounds with specific pKa ranges), and temperature conditions. These parameter changes collectively suppress side reactions and condensation, enabling efficient silanol production with minimal byproducts
Solution Approach 2:
The base compound serves as a beneficial intermediary that promotes the desired hydrolysis and condensation reactions while suppressing harmful side reactions. By carefully selecting base compounds with specific pKa values (15-35), the invention achieves selective reaction promotion that eliminates harmful effects and enables efficient production
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 silanol compounds with high yield under mild conditions, suitable for industrial applications and useful as raw materials for a wide range of siloxane compounds across various fields.
Implementation Method 1
a silanol compound can be efficiently produced by proton exchange of a silicate with an acid compound having an acid dissociation constant pKa in a specific range
Implementation Method 2
most siloxanes are synthesized via silanol by hydrolysis, such as in a sol-gel method using an alkoxysilane, a halogenated silane or the like as a raw material
Data Source
AI summary
The present invention provides a method for producing a silanol compound capable of efficiently producing a silanol compound. The method for producing a silanol compound includes a proton exchange step of forming a silanol compound having a structure represented by following formula (c) by reacting a silicate having a structure represented by following formula (a) with an acidic compound having an acid dissociation constant pKa of −1 to 20 in dimethyl sulfoxide (DMSO).(In formula (a), Qi+ represents an i-valent cation and i represents an integer of 1 to 4).