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Efficient dehydrative C–N bond formation using alcohols and amides in the presence of silica supported perchloric acid as a heterogeneous catalyst
Biswanath Das,...
Tetrahedron Letters
Volume 52, Issue 27, 6 July 2011, Pages 3521-3522
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http://dx.doi.org/10.1016/j.tetlet.2011.05.001