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Jana, U., Maiti, S., & Biswas, S. (2008). An efficient FeCl3-catalyzed amidation reaction of secondary benzylic and allylic alcohols with carboxamides or p-toluenesulfonamide. Tetrahedron Letters, 49(5), 858–862. doi:10.1016/j.tetlet.2007.11.176 
10.1016/j.tetlet.2007.11.176