Efficient one-pot synthesis of spiro heterocycles using Brønsted acidic ionic liquid, indicating a green chemistry approach.
An efficient and sustainable one-pot protocol has been developed for the synthesis of spiroxanthene and spirochromenecarboxylate derivatives using 5–6 mol% of the Brønsted acidic ionic liquid [CMMIM][BF 4 ] in aqueous ethanol media with high yields.
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Begum et al. (2026) studied this question.
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