Cyclic Hydrogenated Silane Production via Lewis Acid Deccomplexation

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Solution Overview

Problem

Current methods for producing cyclic hydrogenated silane compounds are inefficient and require complex processes, leading to low yields and stability issues.

Innovation Solution

A process involving decomplexation of a cyclic halosilane compound with a Lewis acid to obtain a noncomplexed cyclic halosilane with high solvent solubility, followed by reduction with a metal hydride to produce a cyclic hydrogenated silane compound, using a salt of a cyclic halosilane compound with a phosphonium or ammonium salt to suppress side reactions and improve storage stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional methods are used to produce cyclic hydrogenated silane compounds, then the production process can be carried out, but the efficiency is low and the process is complex

Engineering Contradiction:

Improveproduction efficiencyVSAvoidprocess complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The production process is divided into distinct sequential steps: cyclization coupling to form cyclic halosilane, decomplexation to obtain noncomplexed cyclic halosilane, and reduction to produce cyclic hydrogenated silane. This segmentation allows each step to be optimized independently, improving overall efficiency while maintaining clear process control.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The decomplexation step is introduced as a preliminary action before reduction. By removing the complexing agent (phosphonium or ammonium salt) before the reduction reaction, the cyclic halosilane is converted to its noncomplexed form which has higher solvent solubility, enabling more efficient reduction reactions and higher yields.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If complexed cyclic halosilane is used directly for reduction, then the process is simpler, but the solvent solubility is low and reduction efficiency decreases

Engineering Contradiction:

Improvereduction efficiencyVSAvoidprocess simplicity

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The complexing agent (phosphonium or ammonium salt) acts as an intermediary that stabilizes the cyclic halosilane during synthesis and storage, then is removed in the decomplexation step. This intermediary approach allows the cyclic halosilane to be handled safely and efficiently, with the decomplexation enabling subsequent high-efficiency reduction.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The decomplexation step changes the chemical state of the cyclic halosilane from complexed to noncomplexed form. This parameter change dramatically improves solvent solubility, allowing the reduction reaction to proceed at higher concentrations and with greater efficiency.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional reduction methods are used, then the cyclic halosilane can be reduced, but side reactions occur and pyrophoric gases are generated

Engineering Contradiction:

Improvestorage stabilityVSAvoidside reactions and pyrophoric gases

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The use of phosphonium or ammonium salts creates a stable, controlled environment for the cyclic halosilane. These salts form stable complexes that prevent unwanted side reactions and suppress the generation of pyrophoric gases during handling and storage, improving overall process safety and reliability.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The complexing agent, which initially might be seen as an unnecessary addition, actually converts potential harmful side reactions into beneficial stability. The phosphonium or ammonium salt complex prevents decomposition and pyrophoric gas generation, then is easily removed in the decomplexation step to give the desired noncomplexed product.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 enables efficient production of cyclic hydrogenated silane compounds with high yield and improved storage stability, reducing the generation of by-products and pyrophoric gases, and facilitating the production of high-purity cyclic silane compounds.

Implementation Method 1

a decomplexation step of contacting a salt of a cyclic halosilane compound with a Lewis acid compound to react, thereby obtaining a cyclic halosilane compound

Methodology Applied

Scientific EffectLewis acid-base reaction:

Implementation Method 2

a reduction step of contacting the cyclic halosilane compound with a metal hydride to reduce the cyclic halosilane compound, thereby obtaining a cyclic hydrogenated silane compound

Methodology Applied

Scientific EffectReduction reaction: Reduction

Data Source

PatentUS10544171B2Process for producing cyclic hydrogenated silane compound

Publication Date: 2020.01.28 NIPPON SHOKUBAI CO LTD

AI summary

A process for producing a cyclic hydrogenated silane compound comprising: a decomplexation step of contacting a salt of a cyclic halosilane compound with a Lewis acid compound to react, thereby obtaining a cyclic halosilane compound; and a reduction step of contacting the cyclic halosilane compound with a metal hydride to reduce the cyclic halosilane compound, thereby obtaining a cyclic hydrogenated silane compound.