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 freephenolic 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 spectroscopicproperties. 1H and 13C NMR and circular dichroism data are related to selected
Oligomeric flavanoids. Part 17. Absolute configurations of flavan-3-ols and 4-arylflavan-3-ols via the Mosher method
作者:Wanda Rossouw、Alexander F. Hundt、Jacobus A. Steenkamp、Daneel Ferreira
DOI:10.1016/s0040-4020(01)89554-5
日期:1994.1
1H NMR analysis of R-(+)- and S-(−)-α-methoxy-α-trifluoromethylphenyl acetic acid (MTPA) esters of flavan-3-ols and 4-arylflavan-3-ols permits assessment of absoluteconfigurations of C-3 of these condensed tannin structural units.
flavan-3-ols和4-芳基flavan-3-ols的R -(+)-和S -(-)-α-甲氧基-α-三氟甲基苯基乙酸(MTPA)酯的1 H NMR分析这些缩合的单宁结构单元的C-3中
Steynberg, Jan P.; Burger, Johann F. W.; Young, Desmond A., Heterocycles, 1989, vol. 28, # 2, p. 923 - 935
作者:Steynberg, Jan P.、Burger, Johann F. W.、Young, Desmond A.、Brandt, Edward V.、Ferreira, Daneel