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Sulfonated carbon (C-SO3H) nano/micro powder derived from waste biomaterial offers a green catalytic approach in several chemical transformations due to its good performance and reusability. In this report, we synthesized carbon powder from waste litchi peels (LPC) and integrated it with sulfonic acid to obtain LPC-SO3H as a heterogeneous solid acid catalyst.
The objective of this work is the development of a biowaste-derived solid acid catalyst and the investigation of its catalytic application in the synthesis of 4-(substituted phenylamino)-2H-chromen-2-ones.
The LPC-SO3H was synthesized by first pyrolyzing waste litchi peel at 400°C for approximately 2 hours, followed by sulfonation with concentrated H2SO4. The prepared LPC-SO3H was characterized by XRD, FT-IR, SEM-EDX, and XPS binding studies. The catalytic application of LPC-SO3H powder was evaluated for the synthesis of 4-(substituted phenylamino)-2H-chromen-2-ones under microwave irradiation.
The characterization techniques confirmed the formation of LPC-SO3H, and acid-base titration showed the total acidity of LPC-SO3H to be 2.05 mmol/g.
The LPC-SO3H powder was found to be a good, recyclable catalyst for the synthesis of the targeted 4-(substituted phenylamino)-2H-chromen-2-ones with a simple work-up procedure
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