Abstract 1‐Butyl‐3‐methylimidazolium hydrogen sulfate [bmim]HSO 4 as an acidic ionic liquid was prepared and used as a catalyst for the synthesis of 1,8‐dioxo‐octahydroxanthenes in excellent yields and short reaction times at 80 °C. The ionic liquid was easily separated from the reaction mixture by water extraction and was recycled four times without any loss in activity.
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Niknam et al. (2009) studied this question.
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