Iterative exponential growth of stereo- and sequence-controlled polymers

Area of Science:

• Polymer Chemistry
• Organic Synthesis
• Macromolecular Science

Background:

• Achieving sequence-controlled synthetic polymers that mimic biopolymers is a long-standing challenge in chemistry.
• Existing polymerization techniques lack the precision for absolute control over polymer sequence and structure.

Purpose of the Study:

• To develop a novel synthetic strategy for creating sequence-controlled polymers with high precision.
• To demonstrate the synthesis of uniform macromolecules with defined sequences and stereoconfigurations.

Main Methods:

• The iterative exponential growth plus side-chain functionalization (IEG+) strategy was employed.
• The method utilizes enantiopure epoxides as starting materials.
• Macromolecules were synthesized and coupled to form unimolecular polymers.

Main Results:

• A family of uniform macromolecules (>3 kDa) with controlled sequences and stereoconfigurations was synthesized.
• Unimolecular polymers (>6 kDa) with unique sequences and structures were produced.
• Selective side-chain deprotection enabled water solubility for specific hexadecamers.

Conclusions:

• The IEG+ strategy provides a versatile platform for scalable synthesis of sequence-controlled polymers.
• This method enables the creation of macromolecules with sequences and structures not achievable by traditional polymerization.
• The developed macromolecules offer potential applications in various scientific fields.