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A new methodology for assessing macromolecular click reactions and its application to amine–tertiary isocyanate coupling for polymer ligation
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Gody, Guillaume, Roberts, Derrick A., Maschmeyer, Thomas and Perrier, Sébastien (2016) A new methodology for assessing macromolecular click reactions and its application to amine–tertiary isocyanate coupling for polymer ligation. Journal of the American Chemical Society, 138 (12). pp. 4061-4068. doi:10.1021/jacs.5b11831 ISSN 0002-7863.
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Official URL: http://dx.doi.org/10.1021/jacs.5b11831
Abstract
Click reactions have provided access to an array of remarkably complex polymer architectures. However, the term “click” is often applied inaccurately to polymer ligation reactions that fail to respect the criteria that typify a true “click” reaction. With the purpose of providing a universal way to benchmark polymer–polymer coupling efficiency at equimolarity and thus evaluate the fulfilment of click criteria, we report a simple one-pot methodology involving the homodicoupling of α-end-functionalized polymers using a small-molecule bifunctional linker. A combination of SEC analysis and chromatogram deconvolution enables straightforward quantification of the coupling efficiency. We subsequently employ this methodology to evaluate an overlooked candidate for the click reaction family: the addition of primary amines to α-tertiary isocyanates (α-tNCO). Using our bifunctional linker coupling strategy, we show that the amine–tNCO reaction fulfills the criteria for a polymer–polymer click reaction, achieving rapid, chemoselective, and quantitative coupling at room temperature without generating any byproducts. We demonstrate that amine–tNCO coupling is faster and more efficient than the more common amine–tertiary active ester coupling under equivalent conditions. Additionally, we show that the α-tNCO end group is unprecedentedly stable in aqueous media. Thus, we propose that the amine–tNCO ligation is a powerful new click reaction for efficient macromolecular coupling.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QD Chemistry | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||||
| Library of Congress Subject Headings (LCSH): | Polymers -- Experiments -- Research, Isocyanates, Amines | ||||||||
| Journal or Publication Title: | Journal of the American Chemical Society | ||||||||
| Publisher: | American Chemical Society | ||||||||
| ISSN: | 0002-7863 | ||||||||
| Official Date: | 29 February 2016 | ||||||||
| Dates: |
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| Volume: | 138 | ||||||||
| Number: | 12 | ||||||||
| Page Range: | pp. 4061-4068 | ||||||||
| DOI: | 10.1021/jacs.5b11831 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 24 May 2016 | ||||||||
| Date of first compliant Open Access: | 25 May 2016 | ||||||||
| Funder: | Gates Cambridge Trust, Royal Society (Great Britain). Wolfson Research Merit Award (RSWRMA), Australian Research Council (ARC), Licella (Firm) | ||||||||
| Grant number: | WM130055 (RSWRMA), P100200339 (ARC) |
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