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Molecules 2012, 17(2), 2231-2239; doi:10.3390/molecules17022231
Communication

Preparation and Physical Properties of Chitosan Benzoic Acid Derivatives Using a Phosphoryl Mixed Anhydride System

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Received: 1 January 2012 / Revised: 15 February 2012 / Accepted: 16 February 2012 / Published: 22 February 2012
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Abstract

Direct benzoylation of the two hydroxyl groups on chitosan was achieved using a phosphoryl mixed anhydride system, derived from trifluoroacetic anhydride (TFAA), benzoic acids (BAs), and phosphoric acid (PA). The reaction is operated as a one pot process under mild conditions that does not require neither an inert atmosphere nor dry solvents. The structures of the synthesized compounds were confirmed by NMR and IR spectroscopy. Solubility tests on the products revealed that they were soluble in organic solvents such as N,N-dimethylformamide (DMF), dimethylsulfoxide (DMSO), and acetone. In the meantime, a morphological study by scanning electron microscopy (SEM) evidently indicated that the chitosan benzoates underwent significant structural changes after the benzoylation.
Keywords: acylation; chitosan benzoate; benzoic acid; trifluoroacetic anhydride; phosphoric acid acylation; chitosan benzoate; benzoic acid; trifluoroacetic anhydride; phosphoric acid
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lee, D.; Quan, Z.S.; Lu, C.; Jeong, J.A.; Song, C.; Song, M.-S.; Chai, K.Y. Preparation and Physical Properties of Chitosan Benzoic Acid Derivatives Using a Phosphoryl Mixed Anhydride System. Molecules 2012, 17, 2231-2239.

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