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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
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The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
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The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
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α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.
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Pyrazole carbodithiolate-driven iterative RAFT single-additions.

Karen Hakobyan1, Benjamin Noble2, Jiangtao Xu1

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Chemical Communications (Cambridge, England)
|July 1, 2024
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Summary
This summary is machine-generated.

Investigating substituent effects in reversible activation fragmentation chain transfer (RAFT) single unit monomer insertion (SUMI) reactions reveals the critical role of Z-group and R-group interactions. C-S bond dynamics are key, unlike conventional RAFT polymerization focusing on C-C bond formation.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Reversible activation fragmentation chain transfer (RAFT) polymerization is a powerful technique for controlled polymer synthesis.
  • Single unit monomer insertion (SUMI) offers precise control over polymer architecture but requires a deep understanding of reaction mechanisms.
  • Substituent effects are known to influence polymerization kinetics, but their specific impact on RAFT SUMI is less understood.

Purpose of the Study:

  • To comprehensively investigate substituent effects in iterative RAFT SUMI reactions.
  • To elucidate the interplay between the pyrazole carbodithiolate (PCDT) Z-group and R-group effects.
  • To expand the scope of RAFT SUMI to new monomer types and sequences.

Main Methods:

  • Utilized the pyrazole carbodithiolate (PCDT) as the Z-group in RAFT SUMI.
  • Systematically varied R-groups and monomer types to study substituent effects.
  • Analyzed reaction kinetics and polymer characteristics.

Main Results:

  • Demonstrated the significant impact of Z-group and R-group effects on RAFT SUMI.
  • Identified C-S bond dissociation/reformation as crucial steps in SUMI, distinct from conventional RAFT.
  • Successfully expanded RAFT SUMI to new monomers and sequences.

Conclusions:

  • Substituent effects in RAFT SUMI must be holistically examined across all reaction steps.
  • The C-S bond dynamics are paramount in RAFT SUMI, differing from the C-C bond focus in conventional RAFT polymerization.
  • This work provides a deeper mechanistic understanding and broader applicability of RAFT SUMI.