New quaternary phosphonium salt as multi-site phase-transfer catalyst for various alkylation reactions
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The present work describes the C-alkylation reactions of fluorene and curcumin catalyzed by a new phosphonium salt, benzene-1,3,5-triyltris(methylene))tris(triphenylphosphonium)bromide, as a multi-site phase-transfer catalyst (MPTC). The catalytic efficiencies were found to be quite effective for di- and tetra-alkylation reactions with very excellent yields under mild base and low concentrations of the catalyst. The synthesized MPTC 3 have privileged catalytic activity compared to commercially available single-site phase-transfer catalysts.
KeywordsMulti-site phase-transfer catalysts Homogeneous catalysis Fluorene Curcumin Tetraalkylation
We acknowledge the financial support of the Department of Science and Technology, New Delhi, India (Grant No. SR/F/1584/2012-13), University Grants Commission, New Delhi, India (Grant No.UGC No.41-215/2012 (SR) and Council of Scientific and Industrial Research, New Delhi, India (Grant No. 01(2540)/11/EMR-II), DST-SERB, Extramural Major Research Project, New Delhi, India (Grant No. EMR/2015/000969).