Novel Brønsted-Acidic Ionic Liquids Based on Benzothiazolium Cations as Catalysts for the Acetalization Reactions

Three novel brønsted-acidic ionic liquids based on benzothiazolium cations ([HBth][CH3SO3], [HBth][CF3SO3] and [HBth][p-Tsa]) were prepared and served as effective and environmentally friendly catalysts for the acetalization reactions. Highly catalytic properties and the temperature-sensitive characteristic of the ionic liquid catalysts were exhibited during the process. The temperature-sensitive characteristic made the catalysts homogeneous in higher temperature during the reaction and precipitated from the reaction medium in lower temperature after the reaction, which was conducive to the isolation of the ionic liquids by simple filtration. Furthermore, a recycling study was executed and confirmed that the ionic liquids could be used multiple times affording without noticeable decrease in efficiency.

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