Table 1. Depolymerization of IPDI-PU Catalyzed by TBD:MSA with Different Amines^f.

^aDifferent ratios were determined by ¹H NMR spectroscopy in DMSO-d₆ from the crude product using the characteristic signals of 1,8-octanediol (δ = 3.37 ppm).

^bDifferent ratios were determined by ¹H NMR spectroscopy in DMSO-d₆ from the crude product using the characteristic signals of IPDA (δ = 2.15 ppm).

^cDifferent ratios were determined by ¹H NMR spectroscopy in DMSO-d₆ from the crude product using the different characteristic signals for the diureas (Figures S24 to S31).

^dThe poor solubility of the crude product in the deuterated solvent for this reaction could have led to an underestimation of this value.

^eThe eventual cross-linking of the obtained urea has led to difficulties while determining the yield of the product.

^fReaction conditions: IPDI-PU (1 equiv), amine (10 equiv), catalyst (0.15 equiv) at 160 °C, 7 h, N₂.