InBr3–[bmim]PF6: a novel and recyclable catalytic system for the synthesis of 1,3-dioxane derivatives

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Abstract
Alkenes smoothly undergo condensation with paraformaldehyde in the presence of 10 mol% indium tribromide in ionic liquids (ILs) such as 1-butyl-3-methylimidazolium hexafluorophosphate [bmim]PF6 or 1-butyl-3-methylimidazolium tetrafluoroborate [bmim]BF4 under mild reaction conditions to afford the corresponding 1,3-dioxane derivatives in excellent yields with high selectivity. The recovered ionic liquid containing catalyst has been recycled in three to four subsequent runs.

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