Spectroscopic properties of free phenolic 4-arylflavan-3-ols as models for natural condensed tannins
作者:Pieter W. Van Zyl、Jan P. Steynberg、Edward V. Brandt、Daneel Ferreira
DOI:10.1002/mrc.1260311206
日期:1993.12
A unique range of free phenolic 4‐arylflavan‐3‐ols consisting of four sets (3′,4′,5,7‐tetrahydroxyflavan‐3‐ol or its 5‐deoxy analogue coupled to phloroglucinol or resorcinol), each composed of three diastereomers (2,3‐trans‐3,4‐trans, 2,3‐trans‐3,4‐cis and 2,3‐cis‐3,4‐trans) were synthesized to assess their spectroscopic properties. 1H and 13C NMR and circular dichroism data are related to selected
一系列独特的游离酚类 4-arylflavan-3-ols 由四组(3',4',5,7-四羟基黄烷-3-ol 或其 5-脱氧类似物与间苯三酚或间苯二酚偶联)组成,每组由三个合成了非对映异构体(2,3-trans-3,4-trans、2,3-trans-3,4-cis 和 2,3-cis-3,4-trans)以评估它们的光谱特性。1H 和 13C NMR 和圆二色性数据与选定的结构和立体化学特征相关,以模拟天然酚类低聚黄酮。