中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 8-[hydroxy(phenyl)methyl]-1,3-dimethyl-7H-purine-2,6-dione | 126235-10-7 | C14H14N4O3 | 286.29 |
通过红外光谱和核磁共振研究表明,在溶液中黄嘌呤1-5更倾向于与手性二铑四[(R)-α-甲氧基-α-(三氟甲基)苯乙酸乙酯基] (Rh*)成侧面配位,而在固态中则涉及到羰基。对于6,至少羰基C-6在溶液中也有贡献于配位。通过详细描述的X射线衍射分析揭示,固态中存在6和Rh*的交替链。通过“二铑法”(在Rh*存在下进行的1H和13C NMR)可以轻松确定手性黄嘌呤6的对映异构体过量。
It is show n by IR and NMR studies that the xanthines 1-5 prefer a side-on com plexation to the chiral dirhodium tetrakis[(R)-α-methoxy-α-(trifluoromethyl)phenylacetatel (Rh*) in solution whereas carbonyl groups are involved in the solid state. For 6, at least the carbonyl group C-6 contributes to complexation in solution as well. A lternating strands of 6 and Rh* exist in the solid state as revealed by X-ray diffraction analysis described in detail. The determination of enantiomeric excess of the chiral xanthine 6 can easily be accomplished by the “dirhodium method ” (1H and 13C NMR in the presence of Rh*).
通过红外光谱和核磁共振研究表明,在溶液中黄嘌呤1-5更倾向于与手性二铑四[(R)-α-甲氧基-α-(三氟甲基)苯乙酸乙酯基] (Rh*)成侧面配位,而在固态中则涉及到羰基。对于6,至少羰基C-6在溶液中也有贡献于配位。通过详细描述的X射线衍射分析揭示,固态中存在6和Rh*的交替链。通过“二铑法”(在Rh*存在下进行的1H和13C NMR)可以轻松确定手性黄嘌呤6的对映异构体过量。