Abstract
Possibilities for the commercial use of condensed tannins as specialty chemicals are increasing rapidly with the increased focus of research on the reactions of polyflavanoid polymers. The past 5 years have seen considerable effort to define reactions of the A-ring primarily to assist in understanding the regioselectivity of interflavanoid bond locations in natural proanthocyanidins and to obtain more information on cross-linking reactions for use of tannins as adhesives. The interflavanoid bond has also received quite a lot of study, and some novel approaches to the use of tannins as adhesives and biocides have resulted from this work. Rearrangement reactions, both of the phloroglucinolic A-ring in procyanidins and of the pyran ring in profisetinidins, have been important in defining the properties of commericial tannin extracts. More interest is beginning to surface involving the B-ring; here, copper complexes of tannins have been shown to be effective fungicides. A summary of reactions that seem interesting from the author’s perspective is presented.
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Hemingway, R.W. (1989). Key Reactions in Developing Uses for Condensed Tannins: An Overview. In: Hemingway, R.W., Karchesy, J.J., Branham, S.J. (eds) Chemistry and Significance of Condensed Tannins. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-7511-1_18
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DOI: https://doi.org/10.1007/978-1-4684-7511-1_18
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