Figure 2. Catalytic cycle for the boric acid catalyzed amidation reaction

From

Greener Synthesis of an Amide by Direct Reaction of an Acid and Amine under Catalytic Conditions

Gabriel Arce, Gonzalo Carrau, Ana Bellomo, David Gonzalez

World Journal of Chemical Education. 2015, 3(1), 27-29 doi:10.12691/wjce-3-1-4