Perfectly Alternating and Regioselective Copolymerization of Carbonyl Sulfide and Epoxides by Metal-Free Lewis Pairs.

abstract

• The preparation of perfectly alternating and regioslective copolymers derived from the copolymerization of carbonyl sulfide (COS) and epoxides by metal-free Lewis pair catalysts composed of a Lewis base (amidine, guanidine, or quaternary onium salts) and a Lewis acid (triethyl borane) is described. Colorless and highly transparent copolymers of poly(monothiocarbonate) were successfully obtained with over 99% tail-to-head content and high molecular weight (up to 92.5kgmol-1 ). In most instances, oxygen-sulfur exchange reactions (O/S ERs), which would generate random thiocarbonate and carbonate units, were effectively suppressed. The turnover frequencies (TOF) of these Lewis pair catalyzed processes were as high as 119h-1 at ambient temperature.

authors

• Darensbourg, Donald
• Wu, Hung-Jen

published proceedings

• Angew Chem Int Ed Engl

altmetric score

• 2

author list (cited authors)

• Yang, J., Wu, H., Li, Y., Zhang, X., & Darensbourg, D. J.

citation count

• 129

complete list of authors

• Yang, Jia-Liang||Wu, Hai-Lin||Li, Yang||Zhang, Xing-Hong||Darensbourg, Donald J

publication date

• May 2017

publisher

• Wiley  Publisher

published in

• Angewandte Chemie International Edition  Journal

keywords

• Carbonyl Sulfide
• Epoxide
• Lewis Pairs
• Organocatalysis
• Poly(monothiocarbonate)s

PubMed Central ID

• 28444916

Digital Object Identifier (DOI)

• 10.1002/anie.201701780

start page

• 5774

end page

• 5779

volume

• 56

issue

• 21

URL

• http://dx.doi.org/10.1002/anie.201701780