78185-34-9

Upstream product

• 108-24-7 acetic anhydride 
• 78185-25-8 (2S,3R,4S,2'R,3'S)-2,2'-Bis-(3,4-dimethoxy-phenyl)-7,5',7'-trimethoxy-3,4,3',4'-tetrahydro-2H,2'H-[4,8']bichromenyl-3,3'-diol 
• 186581-53-3 diazomethane 
• 78306-10-2 (2R,3S,4R)-2,3-trans-3,4-cis-3,3',4',7-tetrahydroxy-4-<(2R,3R)-2,3-cis-3,3',4',5,7-pentahydroxyflavan-8-yl>flavan 

Relevant academic research and scientific papers

NATURAL (-)-FISETINIDOL-(4,8)-(-)-EPICATECHIN PROFISETINIDINS

The natural occurrence of the first profisetinidins associated with (-)-epicatechin is demonstrated in the heartwood of three legumes. 1H-NMR spectroscopy at 300 MHz permits assesments of the relative abundance of the predominant rotamers in each of the heptamethyl ether diacetates of the (-)-fisetinidol-(4α,8) and (4β,8)-(-)-epicatechins at ambient temperatures.

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

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

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.