147197-31-7Relevant academic research and scientific papers
Tannins and Related Compounds. LI. Elucidation of the Stereochemistry of the Triphenoyl Moiety in Castalagin and Vescalagin, and Isolation of 1-O-Galloyl Castalagin from Eugenia grandis
Nonaka,Gen-Ichiro,Ishimaru, Kanji,Watanabe, Michiyo,Nishioka, Itsuo,Yamauchi, Tatsuo,Wan, Alfred S. C.
, p. 217 - 220 (2007/10/02)
The chirality of the nonahydroxytriphenoyl group in castalagin (1) and vescalagin (2) was determined to be in the S,S-series on the basis of circular dichroism analysis.In addition, a new ellagitannin (4) has been isolated from the leaves of Eugenia grandis (Myrtaceae), and the structure was established to be 1-O-galloyl castalagin on the basis of chemical and spectroscopic evidence. Keywords --- castalagin; vescalagin; C-glycosidic ellagitannin; atropisomerism; absolute stereochemistry; nonahydroxytriphenoyl group; flavogallonic acid; Eugenia grandis; 1-O-galloyl castalagin
