Tetrabutylammonium bromide (TBAB): a neutral and efficient catalyst for the synthesis of biscoumarin and 3,4-dihydropyrano[c]chromene derivatives in water and solvent-free conditions
Tetrahedron Letters
Volume 50, Issue 28, P 4125-4127
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http://dx.doi.org/10.1016/j.tetlet.2009.04.125Carmela De Risia, Luca Ferrarob, Gian P. Pollinia, Sergio Tanganellib, Filippo Valentea and Augusto C. Veronese
Bioorganic & Medicinal Chemistry
Volume 16, Issue 23, 1 P 9904-9910
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http://dx.doi.org/10.1016/j.bmc.2008.10.027Thomas Prisinzano, John Podobinskia, Kevin Tidgewella, Min Luoa and Dale Swenson
Tetrahedron: Asymmetry
Volume 15, Issue 6, Pages 1053-1058
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http://dx.doi.org/10.1016/j.tetasy.2004.01.039