Binaphthyl Synthesis via Alkali Metal Iodide Mediation
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Solution Overview
Problem
Current methods for producing 2,2'-bis(carboxymethoxy)-1,1'-binaphthyl or 2,2'-bis(ethoxycarbonylmethoxy)-1,1'-binaphthyl face challenges in achieving good reaction efficiency, especially when using chloroacetic acid ester in low-permittivity solvents, and struggle with efficiently removing inorganic salts.
Innovation Solution
A method involving the reaction of 1,1'-binaphthalene-2,2'-diol with chloroacetic acid ester in the presence of an alkali metal iodide and a C5 to C8 aliphatic ketone solvent, such as methyl isobutyl ketone, which enhances reaction efficiency and facilitates easy removal of inorganic salts by allowing a water washing operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chloroacetic acid ester is used in a low-permittivity solvent, then the reaction cost is reduced, but the reaction efficiency deteriorates
Solution Approach 1:
The patent introduces an alkali metal halide (such as sodium iodide or potassium iodide) as an intermediary substance to mediate the reaction between chloroacetic acid ester and 1,1'-binaphthalene-2,2'-diol. The alkali metal halide facilitates the reaction by forming a more reactive intermediate species, thereby enabling efficient reaction in low-permittivity solvents without requiring high-reactivity halogenated acetic acid esters
Solution Approach 2:
The patent changes the chemical environment parameters by adding alkali metal halide to the reaction system. This alters the reactivity parameters of the chloroacetic acid ester, enabling it to react efficiently in low-permittivity solvents where it would normally show low reactivity
2Ease of manufacture
If conventional methods are used to produce the binaphthyl compound, then the production process is established, but the removal of inorganic salts becomes difficult
Solution Approach 1:
The patent uses a low-permittivity solvent (such as methyl isobutyl ketone) in which inorganic salts have low solubility. This allows the inorganic salts to be extracted and separated from the reaction mixture through simple filtration or decantation, making the removal process easy and efficient
Solution Approach 2:
The patent exploits the difference in solubility properties between the organic reaction products and inorganic salts in low-permittivity solvents. The organic compounds remain soluble while inorganic salts precipitate, creating a local separation based on solubility quality differences
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 method achieves high reaction efficiency with reduced by-products and rapid separation of inorganic salts, making it suitable for industrial production of resin raw materials with low inorganic salt content.
Implementation Method 1
reacting 1,1'-binaphthalene-2,2'-diol and a chloroacetic acid ester represented by formula (1) below with each other in a C5 to C8 aliphatic ketone solvent in the presence of an alkali metal iodide
Implementation Method 2
reacting 1,1'-binaphthalene-2,2'-diol and a chloroacetic acid ester represented by formula (1) below with each other in a C5 to C8 aliphatic ketone solvent
Implementation Method 3
the use of a ketone solvent having low solubility in water, such as methyl isobutyl ketone, enables a water washing operation after the reaction and further enables a separation operation in a short time, thus allowing inorganic salts used in the reaction to be easily removed
Data Source
AI summary
An object is to provide a novel method for producing a binaphthyl, the method achieving good reaction efficiency and allowing an inorganic salt to be easily removed. As a solution, a method for producing a 2,2'-bis(alkoxycarbonylmethoxy)-1,1'-binaphthyl represented by formula (2), the method including reacting 1,1'-binaphthalene-2,2'-diol and a chloroacetic acid ester represented by formula (1) with each other in a C5 to C8 aliphatic ketone solvent in the presence of an alkali metal iodide, is provided.