Sulfonated polystyrene foam waste as an efficient catalyst for Friedel-Crafts type reactions.

ABSTRACT: The catalytic efficiency of sulfonated polystyrene foam waste (SPS) and sulfonated gamma alumina (SGA) in Friedel-Crafts type reactions was compared. All of the materials were studied using the state-of-the-art characterization techniques. SPS was found to carry a higher load of -SO₃H functional groups (1.62 mmol H⁺ per g) compared to SGA (1.23 mmol H⁺ per g), contributing to its slightly higher efficiency in the regioselective ring-opening of 2-(phenoxymethyl)oxirane with indole. Under mild and solvent-free conditions, SPS catalyzed the reaction of various indoles and oxiranes (9 examples) with acceptable yields (55-99%). The catalyst's efficiency was further validated in synthesizing various bis(indolyl)methanes (8 examples, 88-99% yield). Recyclability t

SUBMITTER: Moazzen B 

PROVIDER: S-EPMC11697390 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature