Trans-Terminal Diphosphites for Higher Aldehyde Yield
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Solution Overview
Problem
Existing hydroformylation processes using Group VIII transition metal catalysts and conventional ligands like phosphines, phosphites, and phosphonites do not achieve optimal yields of aldehydes.
Innovation Solution
The use of diphosphites with trans-positioned substituents, specifically compounds of formula (I), in combination with a Rh compound, under controlled pressure and temperature conditions, enhances the yield of aldehydes in the hydroformylation of olefins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional ligands (phosphines, phosphites, phosphonites) are used with Group VIII transition metal catalysts, then the hydroformylation reaction can proceed, but the aldehyde yield is not optimal
Solution Approach 1:
The patent changes the chemical parameters of the ligand by introducing a specific diphosphite structure with trans-positioned substituents and a bridging oxygen atom. This structural modification alters the electronic and steric properties of the ligand, enabling optimal aldehyde yields of up to 97% in hydroformylation reactions
Solution Approach 2:
The invention creates a composite ligand structure combining two phosphite moieties linked by a bridging oxygen atom, forming a bidentate diphosphite ligand. This composite structure provides synergistic effects that improve both catalytic activity and aldehyde yield compared to monodentate phosphite ligands
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 method significantly increases the yield of aldehydes, as demonstrated by the catalysis experiments with compounds (1) and (2), achieving up to 97% aldehyde yield compared to a reference ligand.
Implementation Method 1
Phosphorus-containing compounds play a crucial role as ligands in a variety of reactions, e.g. in hydrogenation, hydrocyanation and also in hydroformylation
Implementation Method 2
The reaction between olefin compounds, carbon monoxide, and hydrogen in the presence of a catalyst to form aldehydes richer by one carbon atom is known as hydroformylation or oxation
Data Source
AI summary
Diphosphites with trans-position substituents and their use in hydroformylation.