Ketyl Radical Anion Mediated Radical Polymerization and Anionic Ring-Opening Polymerization to Give Polymers with Low...

Area of Science:

• Polymer Chemistry
• Organic Synthesis
• Catalysis

Background:

• Achieving polymers with low molecular weight distribution (Đ) is crucial in polymer chemistry.
• Traditional methods often require separate processes for polymerization and organic synthesis.
• Monofunctional initiators typically possess only one initiation site.

Purpose of the Study:

• To introduce a novel Ketyl Mediated Polymerization (KMP) for simultaneous organic synthesis and polymer production.
• To enable dual polymerization pathways (radical and anionic ring-opening) from a single initiation system.
• To achieve the synthesis of small molecules and polymers with low Đ in a one-pot reaction.

Main Methods:

• Development of Ketyl Mediated Polymerization (KMP) utilizing ketyl radical anion species.
• Initiation via single electron transfer leading to ketyl radical anion formation.
• Simultaneous organic synthesis (cyclopentane derivatives via 3-3 coupling and cyclization) and polymerization (polystyrene and polycaprolactone).

Main Results:

• Successful one-pot synthesis of cyclopentane derivatives and polymers with low Đ.
• Preparation of polystyrene via radical polymerization and polycaprolactone via anionic ring-opening polymerization.
• Achieved full monomer conversion under mild conditions using the KMP system.

Conclusions:

• KMP enables the simultaneous execution of organic synthesis and two distinct polymerization types from a single initiation system.
• This approach offers significant savings in time, labor, resources, and energy.
• KMP expands the available reaction modes and methodologies in both organic and polymer chemistry.