Spirobiindane Derivatives Preparation via Crystallization
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Solution Overview
Problem
Conventional processes for preparing spirobiindane derivatives are complex, result in low yield and low purity, and are economically unviable due to the formation of by-products.
Innovation Solution
A process involving the reaction of 3,3,3',3'-tetramethyl-2,2',3,3'-tetrahydro-1,1'-spirobiindane-5,5',6,6'-tetraol with a protecting agent and pyridine in a specific fluid medium, followed by separation and crystallization to achieve high purity spirobiindane derivatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional processes are used for preparing spirobiindane derivatives, then the process can be performed with standard methods, but the manufacturing precision and purity are low due to by-product formation
Solution Approach 1:
The patent extracts and removes pyridine from the reaction mixture through separation steps, eliminating this harmful by-product from the final product. The process specifically addresses pyridine removal through extraction with organic solvents followed by crystallization, directly resolving the by-product formation issue while maintaining high purity
Solution Approach 2:
The patent changes physical parameters including temperature control during reaction and crystallization, solvent selection and ratios, and pH adjustment during workup. These parameter changes optimize the reaction to minimize by-products and enable efficient separation, achieving greater than 95% purity
2Ease of manufacture
If conventional processes are used for preparing spirobiindane derivatives, then standard reagents can be used, but the device complexity and procedure complexity increase
Solution Approach 1:
The patent combines multiple operations into streamlined sequences: reaction and workup are integrated, extraction and washing are combined in a single solvent removal step, and crystallization directly follows filtration. This merging reduces the number of discrete steps and equipment needed, simplifying the overall procedure while maintaining effectiveness
Solution Approach 2:
The reaction system is designed to be self-cleaning and self-purifying through the inherent properties of the reagents and products. Pyridine serves as both a base catalyst and a separable by-product, and the product's solubility characteristics enable automatic crystallization upon cooling, reducing the need for additional purification equipment
3Productivity
If conventional processes are used for preparing spirobiindane derivatives, then existing methods can be applied, but the productivity and yield are low
Solution Approach 1:
The patent converts the harmful effect of pyridine (a by-product that complicates purification) into a benefit by using it as a soluble marker that facilitates separation. The pyridine-by-product's solubility characteristics enable easy extraction and removal, and its presence actually aids in monitoring reaction completion, thereby improving overall yield and productivity
Solution Approach 2:
The patent utilizes phase transitions of the product during crystallization to separate it from by-products and improve yield. By controlling temperature-induced phase changes and solvent evaporation, the desired spirobiindane derivative crystallizes in high purity form while by-products remain in solution, achieving greater than 80% yield with greater than 95% purity
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 process yields spirobiindane derivatives with purity greater than 95% and a yield greater than 80%, making it simple, economical, and suitable for polymer synthesis.
Implementation Method 1
reacting 3,3,3′,3′-tetramethyl-2,2′,3,3′-tetrahydro-1,1′-spirobiindane-5,5′,6,6′-tetraol with a protecting agent and pyridine as a base
Implementation Method 2
The crude spirobiindane derivative is further purified by crystallization using at least one second fluid medium to obtain crystals of spirobiindane derivative of Formula I having purity greater than 95%
Implementation Method 3
The unreacted pyridine is separated from the resultant to obtain a crude spirobiindane derivative
Data Source
AI summary
The present disclosure relates to spirobiindane derivatives and a process for preparation of the same. Spirobiindane derivatives are used as intermediates for many commercially important compounds such as chiral polymers. The present disclosure provides a simple and economical process for the preparation of spirobiindane derivatives of Formula (I) with high yield and having high purity.