Aldehyde-Modified Silicone Synthesis via Alcohol Oxidation

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Solution Overview

Problem

Existing methods for producing aldehyde-modified silicones, such as hydrosilylation, often result in competitive reactions that decrease the yield and purity of the target silicone.

Innovation Solution

The method involves oxidizing a hydroxymethyl group of a carbinol-modified silicone using an oxidation reaction without hydrosilylation, thereby preventing the competitive reaction and producing a high-purity aldehyde-modified silicone.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If hydrosilylation reaction is used to produce aldehyde-modified silicone, then versatility of the reaction is improved, but yield and purity of the target product deteriorate due to competitive reaction with carbonyl group

Engineering Contradiction:

Improveversatility of hydrosilylation reactionVSAvoidpurity of aldehyde-modified silicone

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent extracts and eliminates the problematic hydrosilylation step from the synthesis route. By using oxidation of primary alcohol instead of hydrosilylation, the method removes the source of competitive reaction while maintaining the ability to produce aldehyde-modified silicone with high purity and yield.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the chemical reaction parameter from hydrosilylation to oxidation reaction. This fundamental change in reaction type eliminates the competitive reaction with carbonyl group while achieving the desired transformation of primary alcohol to aldehyde, thereby improving product purity.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If hydrosilylation reaction is used to produce aldehyde-modified silicone, then versatility of the reaction is improved, but yield of the target product deteriorates due to competitive reaction

Engineering Contradiction:

Improveversatility of hydrosilylation reactionVSAvoidyield of aldehyde-modified silicone

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent removes the hydrosilylation reaction step that causes yield loss through competitive reactions. By substituting it with an oxidation reaction of primary alcohol, the method eliminates the side reaction pathway while maintaining product formation efficiency.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent substitutes the hydrosilylation mechanism with an oxidation mechanism. This replacement changes the fundamental chemical pathway from addition reaction to oxidation reaction, eliminating the competitive reaction with carbonyl group and improving overall yield.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If oxidation reaction of primary alcohol is used instead of hydrosilylation, then purity of aldehyde-modified silicone is improved, but versatility of the reaction method deteriorates

Engineering Contradiction:

Improvepurity of aldehyde-modified siliconeVSAvoidversatility of reaction method

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent uses primary alcohol as an intermediary functional group that can be introduced into the silicone molecule through carbinol modification, then converted to aldehyde through oxidation. This two-step approach maintains versatility in introducing different aldehyde groups while ensuring high purity through selective oxidation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent performs preliminary carbinol modification to introduce primary alcohol groups into the silicone structure before performing the oxidation reaction. This preliminary action enables versatile introduction of different aldehyde groups while maintaining control over the reaction selectivity and product purity.

Inventive Principle:

Principle #10Preliminary action

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 approach allows for the production of high-purity aldehyde-modified silicones with high yield, suitable for use as resin modifiers and feel improvers in cosmetics.

Implementation Method 1

the oxidation reaction of a primary alcohol

Methodology Applied

Scientific EffectOxidation reaction: Oxidation

Data Source

PatentEP4512847A1Aldehyde-modified silicone and method for producing same

Publication Date: 2025.02.26 SHIN ETSU CHEMICAL CO LTD

AI summary

Provided are a high-purity aldehyde-modified silicone and a method for producing the aldehyde-modified silicone in which a competitive reaction in which a hydrosilyl group is added to a carbonyl group of an aldehyde does not proceed. An aldehyde-modified silicone having one or two aldehyde groups per molecule is represented by the following formula (1): [Chem. 1] (AR12SiO1/2)1(R13SiO1/2)a(R12SiO2/2)b(R1SiO3/2)c(SiO4/2)d (1) wherein A is a linear or branched alkylene group (-R-) or alkyleneoxyalkylene group (-R-O-R-) having 2 to 20 carbon atoms and is an organic group having one or two aldehyde groups at an end thereof, R1 is independently a group selected from an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, and an aralkyl group having 7 to 10 carbon atoms, a is 0 < a ≤ 3, b is 0 < b ≤ 200, c is 0 ≤ c ≤ 1, and d is 0 ≤ d ≤ 1, provided that 1 ≤ a + b + c + d ≤ 200.