Determination of ¹³C NMR Shifts for Carbons Beta and Gamma to Oxygen in Poly(Olefin Sulfone)s

Abstract

We have established parameters that enable the prediction of ¹³C NMR chemical shifts for carbons β and γ to a sulfoxide or sulfone oxygen(s). Carbons β were found to be moved upfield by ∼ 21 ppm and those γ downfield by ∼ 7.7 ppm in chloroform. We tested these parameters by sequentially oxidizing poly(butyl thirane) to its corresponding polysulfone and assigned the new peaks observed in the ¹³C NMR on the basis of their proximity to the oxygen atom(s).

Keywords:

• ¹³C NMR
• Liquid crystalline
• NMR
• Poly(butyl thirane)
• Poly(olefin sulfone)

Research sponsored by the Department of Education for Northern Ireland and the Ministry of Defence, Malvern, Worcs., UK