3,4-Dialkylphenol Bisphosphite Ligands for Higher Aldehyde Yield

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Solution Overview

Problem

Existing hydroformylation processes face challenges in achieving high yields of aldehydes from olefins, particularly with bisphosphite compounds.

Innovation Solution

The use of bisphosphite compounds with a 3,4-dialkylphenol wing component, specifically represented by structures (I) and (IIa), in combination with rhodium catalysts, to enhance the hydroformylation process efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional bisphosphite compounds are used in hydroformylation, then the reaction can proceed, but the yield of aldehyde is insufficient

Engineering Contradiction:

Improvealdehyde yieldVSAvoidreaction efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the molecular structure of bisphosphite compounds by changing specific parameters - introducing a 3,4-dialkylphenol wing component with specific substituents (R1, R2, R3, R4) and their respective constraints. This structural parameter change optimizes the ligand's interaction with the rhodium catalyst, thereby improving both aldehyde yield and reaction efficiency simultaneously.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite ligand system by combining specific structural elements - the phenol core with alkyl substituents at positions 3 and 4, and additional alkyl groups at positions 1 and 2. This composite molecular structure provides optimal steric and electronic properties for enhancing catalytic performance in hydroformylation reactions.

Inventive Principle:

Principle #40Composite materials

2Productivity

If existing bisphosphite compounds are used, then the hydroformylation reaction can be catalyzed, but the productivity is limited

Engineering Contradiction:

Improvereaction rateVSAvoidcompound structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by introducing specific functional groups and substituents at particular positions of the bisphosphite molecule. The 3,4-dialkylphenol wing component has specific alkyl groups (R1-R4) with defined constraints, creating localized electronic and steric effects that enhance catalytic activity without requiring complex overall molecular structures.

Inventive Principle:

Principle #3Local quality

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

The described compounds achieve improved yields of aldehydes, with yields ranging from 35% to 40% in catalysis experiments, demonstrating enhanced performance over comparative compounds.

Implementation Method 1

The invention relates to bisphosphites with a 3,4-dialkylphenol wing component and their use in hydroformylation... Adding a substance comprising Rh... whereby the olefin is converted to an aldehyde

Methodology Applied

Scientific EffectCatalysis: Catalysis