Sulfide Synthesis via Sulfur Trioxide and Base Metal Catalysts
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Solution Overview
Problem
Existing synthetic techniques for forming sulfide compounds, such as aryl sulfides, are limited in terms of flexibility and yield, hindering their application in pharmaceuticals and organic semiconductors like OLEDs and OFETs.
Innovation Solution
A method using Scheme 1, where X1, X2, and X3 are independently selected from F, Cl, Br, and I, and R1 and R2 from alkyl, cycloalkyl, alkenyl, etc., with optional covalent linking and potentially no catalyst, to form sulfide compounds with improved flexibility and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If known synthetic techniques are used to form sulfide compounds, then the synthesis can be performed with existing methods, but the flexibility and yield are limited
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by using sulfur trioxide as the sulfur source instead of traditional reagents, and by employing specific base metals ( zinc, cadmium, mercury, or their salts) as catalysts. These parameter changes enable both high yields (greater than 30%, 40%, 50%, or 60% as stated in the technical effect) and broad flexibility in synthesizing diverse sulfide compounds including aryl sulfides, thioethers, and dibenzothiophene derivatives.
2Adaptability or versatility
If known synthetic techniques are used to form sulfide compounds, then the synthesis can be performed with existing methods, but the flexibility and yield are limited
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by using sulfur trioxide as the sulfur source instead of traditional reagents, and by employing specific base metals ( zinc, cadmium, mercury, or their salts) as catalysts. These parameter changes enable both high yields (greater than 30%, 40%, 50%, or 60% as stated in the technical effect) and broad flexibility in synthesizing diverse sulfide compounds including aryl sulfides, thioethers, and dibenzothiophene derivatives.
3Speed
If catalysts are used in the synthesis, then the reaction rate may improve, but the process complexity increases
Solution Approach 1:
The patent employs simple base metal catalysts (zinc, cadmium, mercury, or their salts) that are inexpensive and can be easily handled. These catalysts promote the reaction between aryl halides and sulfur trioxide to form sulfide compounds efficiently. The simplicity of these catalysts and their ease of use reduces process complexity while maintaining high reaction rates, allowing the synthesis to be performed without complex catalytic systems.
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 enhances the synthesis of sulfide compounds, achieving yields greater than 30%, 40%, 50%, or 60%, and allows for the production of diverse sulfides suitable for clinical and electronic applications.
Implementation Method 1
A method of making sulfide compounds using Scheme 1: [reaction scheme showing formation of C-S bonds]
Data Source
AI summary
According to one embodiment of the present disclosure, a method of making sulfide compounds using Scheme 1is disclosed. In Scheme 1, X1, X2, and X3 are independently selected from the group consisting of F, Cl, Br, and I; Y is selected from the group consisting of Cl, Br, and I; and R1 and R2 are independently selected from the group consisting of alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, cycloalkynyl, alkyl, aryl, and heteroaryl, wherein R1 and R2 may be further substituted, and wherein R1 is optionally covalently linked to R2 and the reaction is intramolecular. In some embodiments, no catalyst is used in Scheme 1.