Programmable Macrocyclic Enoate-Mediated Regioselective ROMP for Sequence-Controlled Polymer Synthesis

Area of Science:

• Polymer Chemistry
• Macromolecular Engineering
• Organic Synthesis

Background:

• Entropy-driven ring-opening metathesis polymerization (ED-ROMP) is a key strategy for creating sequence-controlled polymers.
• Traditional cyclic templates for ED-ROMP often involve complex synthesis and struggle with regio- and stereospecificity.

Purpose of the Study:

• To develop an easily accessible macrocyclic olefin template for sequence-controlled polymerization.
• To enable precise encoding of sequence information within polymer chains.
• To create a model system for studying sequence-property relationships in polymers.

Main Methods:

• Utilized olefin cross-metathesis between acrylates and terminal olefins for template synthesis.
• Employed an iterative stepwise growth approach for precise sequence encoding.
• Performed entropy-driven ring-opening metathesis polymerization (ED-ROMP) with the novel macrocyclic monomer.

Main Results:

• Successfully synthesized an easily accessible macrocyclic olefin template with an enoate motif.
• Achieved precise sequence control in polymers through iterative monomer addition.
• Demonstrated tunable sequence compositions in the resulting sequence-controlled polymers.

Conclusions:

• The developed macrocyclic enoate monomer is compatible with tail-to-head ED-ROMP.
• This provides a versatile platform for precision macromolecular engineering.
• The sequence-controlled polymers serve as valuable models for structure-property investigations.