Journal
TETRAHEDRON LETTERS
Volume 48, Issue 21, Pages 3753-3756Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.03.077
Keywords
amino-9,10-anthraquinone; ionic liquid; N-alkylation; trialkyl phosphite
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Ionic liquids such as 1,3-dialkylimidazolium bromides make excellent catalysts and solvents for N-alkylation of amino-9,10-anthraquinones in the presence of trialkyl phosphites. For triethyl phosphite, [bpim][Br] gave better results. The ionic liquids are successfully regenerated and reused. (c) 2007 Published by Elsevier Ltd.
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