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Multicomponent Synthesis of Poly(α-aminophosphine chalcogenide)s and Subsequent Depolymerization.

Jan-Willem Lamberink-Ilupeju1, Mathew J Willans1, Joe B Gilroy1

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|September 7, 2023
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New polymers, poly(α-aminophosphine chalcogenide)s, are synthesized from primary phosphines, diimines, and chalcogens via polymerization. These polymers can be fully depolymerized back to their starting materials using reducing conditions and a Lewis acid.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Primary phosphines and diimines are versatile building blocks in organic synthesis.
  • Step-growth polymerization offers a route to linear polymer architectures.
  • Chalcogen insertion reactions are key to forming novel functional materials.

Purpose of the Study:

  • To develop a novel multicomponent reaction for synthesizing poly(α-aminophosphine chalcogenide)s.
  • To characterize the resulting linear polymers and determine their molecular weights.
  • To investigate the depolymerization of these polymers under reductive conditions.

Main Methods:

  • Multicomponent reactions involving primary phosphines, diimines, and chalcogens (O2, S8).
  • Step-growth polymerization to form poly(α-aminophosphine chalcogenide)s (4-7).
  • 31P{1H} diffusion-ordered NMR spectroscopy (DOSY) for molecular weight determination.
  • Reductive depolymerization using a Lewis acid.

Main Results:

  • Successful synthesis of poly(α-aminophosphine chalcogenide)s (4-7) via a one-pot multicomponent reaction.
  • Characterization confirmed linear polymer structures with determined molecular weights.
  • Complete depolymerization was achieved, quantitatively recovering primary phosphines and diimines, with diimine reduction to diamine (9).

Conclusions:

  • A novel and efficient method for synthesizing poly(α-aminophosphine chalcogenide)s has been established.
  • The synthesized polymers exhibit controlled molecular weights and can be quantitatively depolymerized.
  • This work provides a new pathway for polymer synthesis and controlled degradation, with potential applications in materials science and chemical recycling.