First, the thermal stability of poly-1 was studied using thermogravimetric analysis coupled with gas chromatography-mass spectrometry (TGA-GC-MS) (Fig. and S79-S80). The TGA indicated the onset of mass loss above 140 ºC, with quantitative mass loss after heating to temperatures >210 ºC. The GC-MS data of the volatilized material was remarkably clean: between 140 ºC and 160 ºC only a single peak was observed, with a mass matching that of monomer 1 (Fig. ). Traces of other products were detected at temperatures exceeding 170 ºC, so preparative chemical recycling was tested next at 150 ºC. In the event, poly-1 was heated at 150 ºC under reduced pressure (1 mbar) in a short-path distillation apparatus. After 4 hours, depolymerization was complete and the monomer distilled and isolated as a yellow oil. H NMR spectroscopy analysis confirmed the high purity of the regenerated monomer, which was isolated in 72% yield (Fig. and S81-S84). The high yield, recycled monomer purity, and simplicity of the depolymerization compares favorably to many other depolymerization reactions. was done under reduced pressure to distill and recover regenerated monomer 1 in a 73% isolated yield. H NMR spectrum analysis confirmed the formation of 1 in high purity.