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Fast and selective ring-opening polymerizations by alkoxides and thioureas

Overview of attention for article published in Nature Chemistry, July 2016
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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • One of the highest-scoring outputs from this source (#5 of 2,399)
  • High Attention Score compared to outputs of the same age (99th percentile)
  • High Attention Score compared to outputs of the same age and source (98th percentile)

Mentioned by

news
83 news outlets
blogs
4 blogs
twitter
44 tweeters
facebook
1 Facebook page

Readers on

mendeley
153 Mendeley
citeulike
1 CiteULike
Title
Fast and selective ring-opening polymerizations by alkoxides and thioureas
Published in
Nature Chemistry, July 2016
DOI 10.1038/nchem.2574
Pubmed ID
Authors

Xiangyi Zhang, Gavin O. Jones, James L. Hedrick, Robert M. Waymouth

Abstract

Ring-opening polymerization of lactones is a versatile approach to generate well-defined functional polyesters. Typical ring-opening catalysts are subject to a trade-off between rate and selectivity. Here we describe an effective catalytic system combining alkoxides with thioureas that catalyses rapid and selective ring-opening polymerizations. Deprotonation of thioureas by sodium, potassium or imidazolium alkoxides generates a hydrogen-bonded alcohol adduct of the thiourea anion (thioimidate). The ring-opening polymerization of L-lactide mediated by these alcohol-bonded thioimidates yields highly isotactic polylactide with fast kinetics and living polymerization behaviour, as evidenced by narrow molecular weight distributions (Mw/Mn < 1.1), chain extension experiments and minimal transesterifications. Computational studies indicate a bifunctional catalytic mechanism whereby the thioimidate activates the carbonyl of the monomer and the alcohol initiator/chain end to effect the selective ring-opening of lactones and carbonates. The high selectivity of the catalyst towards monomer propagation over transesterification is attributed to a selective activation of monomer over polymer chains.

Twitter Demographics

The data shown below were collected from the profiles of 44 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 153 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
United States 1 <1%
Unknown 152 99%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 47 31%
Student > Master 23 15%
Researcher 22 14%
Student > Bachelor 10 7%
Student > Postgraduate 8 5%
Other 18 12%
Unknown 25 16%
Readers by discipline Count As %
Chemistry 100 65%
Chemical Engineering 6 4%
Materials Science 5 3%
Biochemistry, Genetics and Molecular Biology 5 3%
Engineering 5 3%
Other 1 <1%
Unknown 31 20%

Attention Score in Context

This research output has an Altmetric Attention Score of 704. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 31 May 2019.
All research outputs
#11,621
of 15,499,194 outputs
Outputs from Nature Chemistry
#5
of 2,399 outputs
Outputs of similar age
#428
of 266,137 outputs
Outputs of similar age from Nature Chemistry
#1
of 54 outputs
Altmetric has tracked 15,499,194 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 2,399 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 31.4. This one has done particularly well, scoring higher than 99% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 266,137 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 54 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 98% of its contemporaries.