Stereoselective photoredox ring-opening polymerization of O-carboxyanhydrides.

Abstract:

:Biodegradable polyesters with various tacticities have been synthesized by means of stereoselective ring-opening polymerization of racemic lactide and β-lactones but with limited side-chain groups. However, stereoselective synthesis of functional polyesters remains challenging from O-carboxyanhydrides that have abundant pendant side-chain functional groups. Herein we report a powerful strategy to synthesize stereoblock polyesters by stereoselective ring-opening polymerization of racemic O-carboxyanhydrides with the use of photoredox Ni/Ir catalysts and a selected Zn complex with an achiral ligand. The obtained stereoblock copolymers are highly isotactic with high molecular weights ( > 70 kDa) and narrow molecular weight distributions (Mw/Mn < 1.1), and they display distinct melting temperatures that are similar to their stereocomplex counterparts. Furthermore, in one-pot photoredox copolymerization of two different O-carboxyanhydrides, the use of such Zn complex mediates kinetic resolution of the comonomers during enchainment and shows a chirality preference that allows for the synthesis of gradient copolymers.

journal_name

Nat Commun

journal_title

Nature communications

authors

Feng Q,Yang L,Zhong Y,Guo D,Liu G,Xie L,Huang W,Tong R

doi

10.1038/s41467-018-03879-5

subject

Has Abstract

pub_date

2018-04-19 00:00:00

pages

1559

issue

1

issn

2041-1723

pii

10.1038/s41467-018-03879-5

journal_volume

9

pub_type

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