Article ID Journal Published Year Pages File Type
175663 Dyes and Pigments 2015 13 Pages PDF
Abstract

•A novel basic ionic liquid is proposed for some useful xanthene derivatives.•Products would be helpful for dye applications.•Avoiding of any metal, or acid catalysts.•The multi component reaction gave good to excellent yields from simple precursors.•The IL was recycled five times without significant loss of catalytic activity.

For the first time a new basic ionic liquid from ethan-1,2-diyl-bis (hydrogen sulfate) and 1,8-diazobicyclo[5.4.0]undec-7-ene was suggested. The catalytic activity of the new ionic liquid was tested for synthesis of xanthene derivatives by condensation of aldehydes with i) dimedone ii) β-naphthol iii) 2-hydroxynaphthalene-1,4-dione iv) dimedone and β-naphthol v) 2-hydroxynaphthalene-1,4-dione and dimedone vi) β-naphthol and 2-hydroxynaphthalene-1,4-dione. This approach is a clean, environmentally friendly and convenient work up protocol. The new ionic liquid is an effective and inexpensive catalyst that could easily be recycled and reused five times without significant loss of catalytic activity.

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Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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