Fig. 4: Decomposition reactions of the biomass-derived polymers.

The yields were determined via ¹H NMR spectroscopy of the crude reaction mixtures relative to the internal standard 1,3,5-trimethoxybenzene. Scheme (A), GPC traces (in THF) (B), and ¹H NMR spectrum (in CDCl₃) of the reaction mixture (C) of the Diels-Alder decomposition of P1 using isoprene. Scheme (D) and GPC traces (in THF) (E) of decomposition via Si–O bond cleavage with Bu₄NF, and the ¹H NMR spectra of B1–B6 (F). The coupling constants of the adjacent vicinal protons of the methine groups of B1–B6 are noted. THF tetrahydrofuran.