Spirobiindane Phosphite Ligands for Selective Hydrocyanation
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Solution Overview
Problem
Existing catalyst systems for hydrocyanation and isomerization reactions, such as those using multidentate phosphite ligands, are not optimized for rapidity, selectivity, and stability, limiting their commercial potential in processes like hydroformylation, hydrocyanation, or isomerization.
Innovation Solution
Development of a multidentate phosphite ligand with a spirobiindane or spirodifluorene backbone and organophosphite groups, combined with transition metals like nickel, to form a catalyst complex for efficient hydrocyanation and isomerization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional multidentate phosphite ligands are used in catalytic systems, then the catalyst can perform hydrocyanation and isomerization reactions, but the reaction efficiency and selectivity are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of the phosphite ligand by introducing a spirobiindane backbone with specific substitution patterns (aryl groups at positions 2 and 2', alkyl groups at positions 7 and 7'). This structural parameter change optimizes the ligand's steric and electronic properties, thereby enhancing both the efficiency and selectivity of the catalytic system for hydrocyanation and isomerization reactions.
Solution Approach 2:
The invention creates a composite catalytic system by combining the specially designed multidentate phosphite ligand with transition metal complexes (such as nickel). This composite approach allows the synergistic interaction between the optimized ligand and metal center to achieve superior catalytic performance in terms of both productivity and selectivity.
2Productivity
If existing catalyst systems are used for hydrocyanation of 1,3-butadiene, then adiponitrile can be produced, but unwanted by-products are formed reducing yield
Solution Approach 1:
The patent applies local quality modification by introducing specific substituents at specific positions of the spirobiindane backbone. The aryl groups at positions 2 and 2' and alkyl groups at positions 7 and 7' create localized electronic and steric effects that selectively promote the desired hydrocyanation reaction pathway while suppressing formation of unwanted by-products, thereby improving yield.
3Productivity
If multidentate phosphite ligands are used for isomerization, then conversion can be achieved, but reaction stability is limited
Solution Approach 1:
Instead of modifying the metal center to improve stability, the patent inverts the approach by optimizing the ligand structure. The spirobiindane backbone with specific aryl and alkyl substitutions provides enhanced steric protection and electronic tuning that stabilizes the catalyst complex during isomerization reactions, maintaining both conversion and stability.
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 catalyst complex enhances the efficiency and selectivity of hydrocyanation and isomerization reactions, particularly in producing adiponitrile from 1,3-butadiene, by minimizing unwanted by-products and maximizing yield.
Implementation Method 1
multidentate phosphite ligand comprising a backbone comprising a substituted or unsubstituted spirobiindane compound or a substituted or unsubstituted spirodifluorene compound and at least two organophosphite groups chemically bonded to the backbone
Implementation Method 2
catalytic processes utilizing such catalytic compositions... hydrocyanation of 1,3-butadiene and/or 3-pentenenitrile
Implementation Method 3
liquid phase process for the isomerization of those nitriles to 3-and/or 4-monoalkene linear nitriles
Data Source
AI summary
A multidentate phosphite ligand comprising a backbone which comprises a substituted or unsubstituted spirobiindane compound and at least two organophosphite groups chemically bonded to the backbone, wherein the organophosphite groups are alkyl phosphite groups or wherein the organophosphite groups are aryl phosphite groups, wherein the aryl moieties on the aryl phosphite groups are phenyl rings substituted with one or more C1-C4 alkyl groups; or which comprises a substituted or unsubstituted spirodifluorene compound and at least two organophosphite groups chemically bonded to the backbone.