【摘要】 从木棉科植物木棉(Gossmpinus malabarica(DC.)Mer)的叶中首次分离纯化得到木棉素(Gossampinusxanthone)。经元素分析、波谱数据和X-射线单晶衍射分析,确认该化合物为1,3,6,7-四羟基-2-β-D-吡喃葡萄糖基口山酮(1,3,6,7-terahydroxy-2-β-D-glucopyanosyl-xanthone)。C19H18O11,M=422.34。晶体属斜方晶系,空间群P21212。晶胞参数a=7.265(5),b=30.086(4),c=8.342(2),V=1822(2)3,Z=4,Dc=1.54g/cm3,F(000)=880。木棉素分子由平面口山酮基和椅式葡萄糖基通过C(2)-C(1′)键连接而成。两基团的两个最小二乘平面间的夹角约为76.5°。存在分子内氢键O┄H…O的同时,也有分子间O┄H…O氢键。更多还原

【Abstract】 The purpose of the thesis is study single-crystal structures of gossampinus xanthome isolated firstly from Gossampinus malabarica leaf.The 1,3,6,7-terahydroxy-2-β-D-glucopyanosyl xanthone as conformational as chinonin and mangiferin was established on the basis of spectral and chemical evidences.Its crystal structure of it was firstly investigated by single-crystal X-ray crystallographic analysis crystallizes in the triclinic system,space group P21212 with a=7.265(5),b=30.086(4),c=8.342(2),V=1822(2)3,Z=4,Dc=1.54 g/cm3,F(000)=880.It is constituted by xanthone group and glucopyranosyl group.The xanthone group is rather flat in shapic,which suggested the presence of a large conjugation system,while the glucopyranosyl group adopts a chair conformation.The dihedral angle between both LS planes of the two groups is about 76.5°.The molecules of the title compound are linked by O┄H…O hydrogen bonds in the crystal.A recent study described as phenolic hydroxyls in xanthone are the main active groups for scavenging.OH,O2,NO.更多还原