Phenolic compounds in branches of Tamarix rasissima

To study the chemical constituents of the branches of Tamarix rasissima,repeated silica gel column chromatography,Sephadex LH-20 chromatography and recrystallization were applied for chemical constituents isolation and purification.Ten phenolic compounds were isolated from the n-BuOH fraction and their structures were elucidated by physical properties and spectra analysis such as UV,ESI-MS and NMR as monodecarboxyellagic acid(1),ellagic acid(2),3,3'-di-O-methylellagic acid(3),3,3'-di-Omethylellagic acid-4-O-β-D-glucopyranoside(4),3,3'-di-O-methylellagic acid-4'-O-α-D-arabinfuranoside(5),ferulic acid(6),isoferulic acid(7),caffeic acid(8),4-O-acetyl-caffeic acid(9),and 4-methyl-1,2-benzenediol(10).All compounds except for isoferulic acid were isolated firstly from this plant except for isoferulic acid,and compounds 5,9 and 10 were obtained from Tamarix genus for the first time.