115648-76-5Relevant academic research and scientific papers
PROCYANIDIN POLYMERS OF DOUGLAS FIR BARK: STRUCTURE FROM DEGRADATION WITH PHLOROGLUCINOL
Foo, Lai Yeap,Karchesy, Joseph J.
, p. 3185 - 3190 (1989)
Reaction of the condensed tannin polymers of Douglas fir inner bark with phloroglucinol yielded catechin, epicatechin, procyanidin B-2, catechin-(4α->2)-phloroglucinol, epicatechin-(4β->2)-phloroglucinol, the novel compound epicatechin-(4α->2)-phloroglucinol and 1,3-di-(2,4,6-trihydroxyphenyl)-1-(3,4-di-hydroxyphenyl)-propan-2-ol.Also isolated were epicatechin-(4β->8)-epicatechin-(4β->2)-phloroglucinol, epicatechin-(4β->6)-epicatechin-(4β->2)-phloroglucinol, and three other novel phloroglucinol adducts, catechin-(4α->8)-epicatechin-(4β->2)-phloroglucinol, epicatechin-(4β->8)-epicatechin-(4β->8)-epicatechin-(4β->2)-phloroglucinol and epicatechin-(4β->6)-epicatechin-(4β->8)-epicatechin-(4β->2)-phloroglucinol.The results suggest that the configuration of the extender units is almost exclusively 2,3-cis, while the terminal units are mixed, with 2,3-cis slightly predominating.The C-4 to C-8 interflavonoid linkage predominates over the C-4 to C-6 linkage by a 4:1 ratio. Key Word Index Pseudotsuga menziesii; Pinaceae; Douglas fir; procyanidin; degradation; phloroglucinol-adducts.
PRENYLATED FLAVAN-3-OLS AND PROCYANIDINS FROM ILLICIUM ANISATUM
Morimoto, Satoshi,Tanabe, Hisako,Nonaka, Gen-Ichiro,Nishioka, Itsuo
, p. 907 - 910 (1988)
Key Word Index-Illicium anisatum; Illiciaceae; prenylated flavan-3-ols; flavan-3-ols; procyanidins; tannins.Two prenylated flavan-3-ols were isolated from Illicium anisatum and their structures characterized by chemical and spectroscopic means as 8-(3,3-dimethylallyl)-(+)-catechin and 6-(3,3-dimethylallyl)-(+)-catechin.In addition, a new proanthocyanidin was isolated, together with several known compounds.The structure of the procyanidin was established as catechin-(4α8)-epicatechin-(4β8)-catechin.
