108907-40-0Relevant articles and documents
Tannins and Related Compounds. LV. Isolation and Characterization of Acutissimins A and B, Novel Tannins from Quercus and Castanea Species
Ishimaru, Kanji,Nonaka, Gen-Ichiro,Nishioka, Itsuo
, p. 602 - 610 (2007/10/02)
Two novel and closely related tannins, designated as acutissimins A (1) and B (2), have been isolated from various Fageceous plants: Quercus acutissima, Q. miyagii, Q. stenophylla, Q. mongolica var. grosseserrata and Castanea crenata.Degradative and synthetic studies combined with 1H- and 13C-NMR spectrometry and various mass spectral measurements have permitted the assignments of the structures, in which (+)-catechin (4) and the C-glycosylated ellagitannin, castalagin (3), are connected through a carbon-carbon linkage.