Protected Thioester Deprotection for Polymer Functionalization
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Solution Overview
Problem
Current thiol-ene coupling methods are limited by the availability of commercially available mercaptans, which restrict the range of functional groups that can be used for polymer functionalization, hindering the preparation of polymers with tailored properties.
Innovation Solution
A process involving the preparation of protected functional thiols, specifically thioesters, which can be deprotected and reacted with polymers having pendant vinyl groups to form functionalized polymers, allowing for a broader range of functional groups and improved polymer functionalization through thiol-ene coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If commercially available mercaptans are used for thiol-ene coupling, then the polymer functionalization process is simple and direct, but the range of functional groups that can be incorporated is limited
Solution Approach 1:
The patent introduces protected thiol compounds (intermediaries) that can be deprotected in situ to generate the active thiol species. These protected thiol compounds serve as mediators between the starting materials and the final functionalized polymer, enabling the incorporation of a broader range of functional groups while maintaining process simplicity through one-pot synthesis.
Solution Approach 2:
The patent employs preliminary protection of thiol groups as thioesters or other protected forms before the actual coupling reaction. This preliminary action allows for the storage and transport of stable intermediates that can be deprotected right before use, expanding the range of available functional groups without complicating the overall synthesis process.
2Adaptability or versatility
If protected thiol compounds are used and deprotected in situ, then the range of functional groups is expanded, but the number of reaction steps increases
Solution Approach 1:
The patent merges the deprotection step and the thiol-ene coupling step into a single one-pot reaction sequence. By combining these operations, the patent eliminates the need for separate isolation and purification steps, thereby expanding the range of functional groups while maintaining high reaction efficiency and productivity.
Solution Approach 2:
The patent ensures continuous useful action by performing deprotection and coupling reactions in a sequential manner within the same reaction vessel without interruption. This continuous process eliminates idle time between steps and maintains high productivity while enabling the use of diverse functional groups through protected thiol intermediaries.
3Adaptability or versatility
If multiple steps are used to prepare functional thiols and then react with polymers, then functional group diversity is achieved, but the overall synthesis time increases
Solution Approach 1:
The patent performs preliminary preparation of protected thiol compounds with diverse functional groups that can be stored stably. These pre-prepared intermediaries are then deprotected and reacted with polymers in a single operation, achieving functional group diversity without increasing synthesis time, as the time-consuming preparation is done in advance.
Solution Approach 2:
The patent segments the synthesis process into two independent parts: (1) preparation of protected thiol intermediaries with various functional groups, and (2) deprotection and coupling with polymers. This segmentation allows for parallel processing and optimization, reducing overall synthesis time while maintaining functional group diversity.
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 enables the convenient and efficient functionalization of polymers with a variety of functional groups, enhancing the versatility of polymer synthesis and allowing for the incorporation of desired side-groups without the need for isolation of intermediates, thus overcoming the limitations of existing methods.
Implementation Method 1
cleaving the functionalized thioester, forming a functional thiol and an acyl group
Implementation Method 2
reacting the polymer with the functional thiol whereby a functionalized polymer is formed
Data Source
AI summary
A process for the preparation of functional molecules using the thiol-ene coupling reaction and a process for the preparation of protected functional thiols, specifically thioesters is provided. The methods may be used to make functional polymers and other molecules. The method of making a functionalized polymer using a thiol-ene reaction comprises: providing a functionalized thioester having the following formula:wherein R is a functional group and COR′ is a protecting group; cleaving the functionalized thioester, forming a functional thiol and an acyl group; providing a polymer having a pendant vinyl group; and reacting the polymer with the functional thiol whereby a functionalized polymer is formed, wherein the functional thiol is not isolated prior to reacting with the polymer.