10586-06-8Relevant academic research and scientific papers
Unusual amount of (-)-mesquitol from the heartwood of Prosopis juliflora
Sirmah, Peter,Dumarcay, Stephane,Masson, Eric,Gerardin, Philippe
experimental part, p. 183 - 189 (2011/04/15)
A large amount of flavonoid has been extracted and isolated from the heartwood of Prosopis juliflora, an exogenous wood species of Kenya. Structural and physicochemical elucidation based on FTIR, 1H and 13C NMR, GC-MS and HPLC analysis clearly demonstrate
Cyclic Ions in the Mass Spectra of Trimethylsilyl Derivatives of Substituted o-Dihydroxybenzenes
Horvat, Robert J.,Senter, Samuel D.
, p. 413 - 417 (2007/10/02)
The mass spectra of trimethylsilyl (TMS) ethers/methyl esters of phenolic acids containing o-dihydroxybenzene groups have base peaks at (1+) instead of the usual (1+) and (1+) that are characteristic of TMS/methyl esters of monohydroxyphenolic acids.These ions, formed by the loss of 31+88 u from the parent ion, possess a cyclic moiety as proven by substitution of deuterium atoms for hydrogen atoms in the TMS groups of the methyl esters of 3,4,5-trihydroxybenzoic (gallic), 3,4-dihydroxybenzoic (protocatechuic) and β-(3,4-dihydroxyphenyl)propenoic (caffeic) acids.Although these cyclic ions are the base peaks in TMS-derivatized o-dihydroxyphenolic acid esters, similar ions represent intense peaks but not neccessarily the base peak in other derivatized compounds such as 1,2-dihydroxybenzene, 1,2-dihydroxy-3-methyl- and 1,2-dihydroxy-4-methyl-benzenes and flavan-3-ols that possess o-dihydroxybenzene groups.Compounds possessing m- or p-dihydroxybenzene groups do not form these cyclic ions; therefore, this procedure for derivatization and interpretation of mass spectra is valuable for the identification of compounds containing o-dihydroxybenzene groups in complex mixtures of isomeric compounds.
Synthesis of Condensed Tannins. Part 3. Chemical Shifts for Determining the 6- and 8-Bonding Positions of 'Terminal' (+)-Catechin Units
Hundt, Hans K. L.,Roux, David G.
, p. 1227 - 1234 (2007/10/02)
Pairs of 6- and 8-functionalised (Br, OH, OAc, CO2Me, and CH2Me groups) 3',4',5,7-tetra-O-methyl-(+)-catechins available through selective bromination and debromination reactions and hence via lithio-analogues, provide diagnostic chemical shifts of their
