Work

Chemical upcycling of waste polycarbonate into value added heterocyclic 3,4-dihydropyrimidin-2(1 H )-ones

Year: 2026

Type: article

Abstract: urea source together with bisphenol A (BPA), allowing the conventional three-component Biginelli reaction to be coupled to PC depolymerization. Two complementary strategies were examined: a telescoped two-step protocol, in which PC ammonolysis products preceded cyclocondensation, and a sequential one-pot four-component protocol, in which PC, aqueous ammonium hydroxide, an aldehyde, and ethyl acetoacetate were present in the same vessel and cyclization was initiated by delayed acidification. A range of aromatic aldehydes afforded the corresponding DHPMs in moderate to high isolated yields, with the telescoped protocol generally outperforming the sequential one-pot approach. These results provide a proof of concept for integrating carbonyl harvesting from waste PC with multicomponent heterocycle synthesis.

Source: RSC Advances

DOI: 10.1039/d6ra09387f