title: New dihydrochalcone glycosides from Lithocarpus litseifolius and the phenomenon of C-H-->C-D exchange observed in NMR spectra of phenolic components.
abstract: Two new dihydrochalcone glycosides named 6''-O-acetyltrilobatin (1) and 3''-O-acetylphloridzin (2) as well as four known compounds were isolated from the leaves of Lithocarpus litseifolius (Hance) Chun (family Fagaceae). Their structures were elucidated on the basis of spectroscopic analyses. The phenomena of C-H --> C-D exchange were observed in NMR spectra of the isolated phenolic components when measured in deuterated methanol.
authors.affiliation: Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.
authors.forename: Zhen-Hua
authors.initials: ZH
authors.lastname: Chen
authors.forename: Ru-Jun
authors.initials: RJ
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Zhao
mesh_terms: D047188:Chalcones / Q000737:chemistry / Q000302:isolation & purification*; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D029962:Fagaceae / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018515:Plant Leaves / Q000737:chemistry
chemical_list: C547886:3''-O-acetylphloridzin; C547885:6''-O-acetyltrilobatin; D047188:Chalcones; D004365:Drugs, Chinese Herbal; D006027:Glycosides; C015812:dihydrochalcone