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Retraction Note: Catalytic living ring-opening metathesis polymerization.

Amit A Nagarkar1, Andreas F M Kilbinger2

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Summary

This study retracts findings on polymer molecular weight dispersity due to irreproducible results with chain-transfer agent CTA1. The agent

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Area of Science:

  • Polymer Chemistry
  • Catalysis

Context:

  • This work involves ring-opening metathesis polymerization (ROMP) using Grubbs catalysts.
  • Accurate control over polymer molecular weight dispersity (PDI) is crucial for material properties.

Purpose:

  • To retract an article due to irreproducible molecular weight dispersities (PDI) reported for chain-transfer agent CTA1.
  • To clarify the limitations of CTA1 in controlling PDI during ROMP.

Summary:

  • The authors failed to reproduce the reported PDI values using CTA1.
  • The reactivity of CTA1 with ruthenium alkylidene complexes is low, requiring impractically long monomer addition times.
  • Even more reactive chain-transfer agents yield broader PDIs than initially claimed for CTA1.

Impact:

  • The claimed molecular weight and dispersity control using CTA1 is inappropriate.
  • This retraction highlights the importance of experimental reproducibility and accurate reporting in catalysis research.
  • The findings necessitate a re-evaluation of CTA1's utility in controlled polymerization.