78306-07-7Relevant academic research and scientific papers
Synthesis of Condensed Tannins. Part 11. Intramolecular Enantiomerism of the Constituent Units of Tannins from the Anacardiaceae: Stoicheiometric Control in Direct Synthesis: Derivation of 1H Nuclear Magnetic Resonance Parameters Applicable to
Viviers, Phillip M.,Kolodziej, Herbert,Young, Desmond A.,Ferreira, Daneel,Roux, David G.
, p. 2555 - 2562 (2007/10/02)
Tannins from the heartwoods of Schinopsis spp. (quebracho) and Rhus spp.(karee) represent mutual condensation products of their associated precursors (2S,3R,4S)(-)-leucofisetinidin, (2R,3S)-(+)-catechin and, to a minor extent, (2R,3R)-(-)-epicatechin.The
Synthesis of Condensed Tannins. Part 4. A Direct Biomimetic Approach to - and -Biflavanoids
Botha, Jacobus, J.,Ferreira, Daneel,Roux, David G.
, p. 1235 - 1245 (2007/10/02)
The generation of flavanyl-4-carbo-cations from flavan-3,4-diols and their condensation with nucleophilic flavan-3-ols to form - and -biflavanoids at ambient temperatures and mildly acidic aqueous conditions apparently simulates the initial step in condensed tannin formation in a number of natural sources.The stereospecificity (or stereoselectivity) of the reaction is conditioned mainly by the 2,3-cis or 2,3-trans stereochemistry of the parent flavan-3,4-diol, but also by the nuclephilicity of the flavan-3-ol, and its regiospecific (or regioselective) course by steric factors arising from variation in substitution of the receptive A-ring of the flavan-3-ol.
