Highly Efficient Suzuki-Miyaura Polymerization Enabled by Direct Transmetalation with Boronic Esters

Area of Science:

• Organic Chemistry
• Materials Science
• Polymer Chemistry

Background:

• Suzuki-Miyaura coupling is crucial for carbon-carbon bond formation using organoboron compounds.
• Protodeboronation of arylboronic acids hinders applications, especially in optoelectronic polymer synthesis.

Purpose of the Study:

• To develop a novel sulfonium salt-mediated Suzuki-Miyaura cross-coupling protocol.
• To synthesize high-quality π-conjugated polymers (CPs) with enhanced optoelectronic properties.

Main Methods:

• Utilized a sulfonium salt catalyst in the Suzuki-Miyaura cross-coupling reaction.
• Investigated the mechanism, focusing on direct transmetalation of boronic esters.
• Synthesized twelve different CPs using diverse electrophiles and nucleophiles.

Main Results:

• Successfully synthesized twelve π-conjugated polymers (CPs) with high quality.
• Achieved enhanced optoelectronic properties, including improved charge carrier mobilities.
• Demonstrated the avoidance of protodeboronation by direct transmetalation of boronic esters.

Conclusions:

• The novel sulfonium salt-mediated method provides an effective and environmentally benign route to device-quality CPs.
• This protocol overcomes limitations of traditional Suzuki-Miyaura reactions concerning unstable boronic acids.
• The findings enable broader synthetic applications in optoelectronic polymer materials.