6743-62-0Relevant academic research and scientific papers
Studies on the constituents of Cimicifuga species. XVIII. Four new xylosides from the aerial parts of Cimicifuga simplex WORMSK
Kusano, Akiko,Shibano, Makio,Kusano, Genjiro
, p. 167 - 172 (1996)
Four new xylosides (1-4) were isolated from the aerial parts of Cimicifuga simplex (Ranunculaceae), and their structures were determined to be 24-epi- 7β-hydroxy-24-O-acetylhydroshengmanol-3-O-β-D-xylopyranoside (1), 25-O- methyl-24-O-acetylhydroshengmanol-3-O-β-D-xylopyranoside (2), 25-O-methyl- 7β-hydroxy-24-O-acetylhydroshengmanol-3-O-β-D-xylopyranoside (3) and 25-O- methyl-1α-hydroxy-24-O-acetylhydroshengmanol-3-O-β-D-xylopyranoside (4).
Ethanolysis of selected catalysis by functionalized acidic ionic liquids: An unexpected effect of ILs structural functionalization on selectivity phenomena
Nowakowska-Bogdan, Ewa,Nowicki, Janusz
, p. 1857 - 1866 (2022/02/05)
A series of functionalized hydrogen sulfate imidazolium ILs were synthesized and applied as catalysts in the reaction of glucose, xylose and fructose with ethanol. In this research, an unexpected selectivity phenomenon was observed. It showed that in this reaction functionalized ILs should be considered as a special type of catalyst. Functionalization of alkyl imidazolium ILs, especially the addition of electronegative OH groups, causes a clear and unexpected effect manifested via visible changes in the selectivity of the reaction studied. In the case of fructose, an increase in the number of OH groups affects an increase in the selectivity towards ethyl levulinate from 14.2% for [bmim]HSO4 to 20.1% for [glymim]HSO4 with an additional increase in selectivity to 5-hydroxymethyfurfural. In turn, for xylose, the introduction of OH groups to the alkyl chain was manifested by a decrease in selectivity to furfural as its ethyl acetal and an increase in selectivity to ethylxylosides. This journal is
Synthesis of Ethyl α-DL-Lyxopyranoside and Ethyl α-DL-Arabinopyranoside from 2-Ethoxy-5,6-dihydro-2H-pyran
Srivastava, R. M.,Brown, R. K.
, p. 307 - 310 (2007/10/02)
Epoxidation of trans-6-ethoxy-5-hydroxy-5,6-dihydro-2H-pyran (3) provides ethyl 3,4-anhydro-β-DL-ribopyranoside (5).Compound 5 in turn affords ethyl α-DL-lyxopyranoside (6) as a major product when the epoxide ring is opened either by hydroxide ion or by water in the presence of an acid catalyst.Reaction of osmium tetroxide with 3 yields ethyl α-DL-arabinopyranoside as principal product which has been identified as its 2,3,4-tri-O-acetyl derivative (8).
