Phosphinobenzene Borane Synthesis via Deprotonated Phosphine Addition
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Solution Overview
Problem
Current methods for producing optically active phosphinobenzene borane derivatives are economically inefficient and yield low results, even when using expensive starting materials and ultralow temperatures.
Innovation Solution
A method involving the reaction of a phosphine borane compound with a 1,2-dihalogenobenzene, where the phosphine borane compound is deprotonated and added to the dihalogenobenzene, reducing impurities and allowing for higher yields of optically active phosphinobenzene borane derivatives at industrially advantageous temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional production methods using expensive starting materials are used, then optical purity can be maintained, but manufacturing cost increases and economic efficiency deteriorates
Solution Approach 1:
The patent replaces expensive starting materials (1,2-bis(phosphino)benzene, 1,2-difluorobenzenetricarbonylchromium, 2-halogenoaniline) with inexpensive 1,2-dihalogenobenzene as the starting material. This substitution dramatically reduces raw material costs while maintaining the ability to produce optically active phosphinobenzene borane derivatives with high optical purity through the novel reaction methodology.
2Manufacturing precision
If ultralow temperature reaction conditions are used, then optical purity can be maintained, but productivity decreases and industrial applicability deteriorates
Solution Approach 1:
The patent fundamentally changes the reaction temperature parameter from ultralow temperatures (−80°C) to industrially advantageous temperatures (−20°C to 50°C). This parameter change is achieved through the novel reaction system using 1,2-dihalogenobenzene and deprotonated phosphine borane compounds, which maintains high optical purity while enabling practical industrial production rates and reducing energy consumption.
3Productivity
If conventional addition order is used, then reaction can proceed, but yield decreases due to side reaction impurities
Solution Approach 1:
The patent inverts the conventional addition order of reactants. Instead of adding 1,2-dihalogenobenzene to the phosphine borane compound, the patent adds the deprotonated phosphine borane compound to 1,2-dihalogenobenzene. This inversion of the addition sequence suppresses side reactions and impurity formation, dramatically improving the yield of optically active phosphinobenzene borane derivatives.
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 significantly improves the yield of optically active phosphinobenzene borane derivatives while maintaining high optical purity, even at elevated temperatures, making the process more industrially viable.
Implementation Method 1
a phosphine borane compound obtained by deprotonating a hydrogen-phosphine borane compound
Implementation Method 2
adding the liquid B to the liquid A to be allowed to react to thereby obtain the phosphinobenzene borane derivative
Data Source
AI summary
A method for producing a phosphinobenzene borane derivative comprises a reaction step (A) of obtaining liquid A containing a 1,2-dihalogenobenzene represented by the following general formula (1):obtaining liquid B containing a phosphine borane compound obtained by deprotonating a hydrogen-phosphine borane compound represented by the following general formula (2):and then adding the liquid B to the liquid A to be allowed to react to thereby obtain the phosphinobenzene borane derivative represented by the following general formula (3):According to the present invention, there can be provided the industrially advantageous method for producing the phosphinobenzene borane derivative.