差向异构体

阐述了差向异构体和差向异构化的定义。差向异构化技术在医药和农药中间体中应用广泛，前景广阔。

It elaborates the definitions of epimer and epimerization , states the applications of epimerization in medicine and pesticide , and points out its expansive prospect .

睾丸素母液中两个新差向异构体的分离与结构鉴定

The isolation and identification of two new epimer from the mother liquid of testosterone

用2DNMR研究一对差向异构体的化学结构

The chemical structures of a pair of epimers studied by 2D NMR

抗孕-53差向异构体的键合相正相HPLC分析与熔融温度测定

Bonded normal phase HPLC determination of ANORDRIN

莫诺甙环口差向异构体的HPLC和ESI-TOF-MS分析

HPLC and ESI-TOF-MS Analysis of the Anomeric Isomers of Morroniside

某些特定结构，如C（20）二萜生物碱中的恶唑烷环以及C（20）差向异构体等的~（13）cNMR谱特征；

~ ( 13 ) C NMR characteristics of some specific struc-tures , for example , oxazolidine ring and C_ ( 20 ) epimers of C_ ( 20 ) - type diterpene alkaloids ;

目的：探讨甘草酸（glycyrrhizicacid，GL）的两个差向异构体αGL和βGL在小鼠体内的分布及其特征。

AIM : To examine the characters of distribution of two epimers of glycyrrhizic acid ( GL ) including α - GL and β - GL in mice .

目的研究桥环黄皮酰胺差向异构体的结构。

AIM To study the structures of the epimerides of cycloclausenamide .

与母体药物相比，相应的差向异构体毒性较低。

Compared with the corresponding parent drugs , epimers showed lower toxicity .

四环素中差向异构体的纸上层析

Paper chromatography of epimer of tetracycline

差向异构体熊去氧胆酸和鹅去氧胆酸的~1H&NMR谱学特征研究及熊胆粉主要成分测定

A Study on ~ 1H-NMR Characteristic Spectra of Epimer UDCA , CDCA and Determination of Bear Bile Powder

三七叶甙制备原人参二醇及其差向异构体

Preparation of Protopanaxadiol and Its Epimer 20 ( R ) - Protopanaxadiol from Leaf Saponins of Panax Notoginseng

甘草中差向异构体对D&氨基半乳糖致大鼠肝损伤治疗作用的肝组织学和亚微结构研究

Curative Effects of Epimeric Glycyrrhizic on Hepatic Injury Induced by D-galactosamine in Rat : Histological and Submicrostructure Research

双氢青蒿素在有机溶媒中存在α与β差向异构体的转化过程。

Dihydroartemisinin has a process of anomeric conversion from β - epimer to α - epimer in organic solvent .

双炔失碳酯差向异构体的分析睾丸素母液中两个新差向异构体的分离与结构鉴定

Analysis of epimer of anorethindrane dipropionate The isolation and identification of two new epimer from the mother liquid of testosterone

国产醋酸甲地孕酮的质量研究：6-羟基-6-甲基-17α-乙酰氧基黄体酮差向异构体的分离与鉴定

Studies on the purity of Chinese megestrol acetate : separation and identification of epimeric isomers of 6-hydroxy-6-methyl-17 α - acetoxy-progesterone

塔格糖是果糖的差向异构体，在分子水平上，除了第四个碳原子上的羟基和氢基团倒置外，D-塔格糖与D-果糖的结构是一样的。

On a molecular level , D-tagatose is structurally identical to D-fructose , except for an inversion of the hydroxyl and hydrogen groups at the fourth carbon atom .

新化合物以已知中间体为原料，经两步还原，手性拆分和O-去甲基反应制备，并确定了四个差向异构体的绝对构型，优势构象和对映体过量值。

The synthesis was started from a known intermediate , followed by two-step reduction , optical resolution and O-demethylation . The absolute configuration , dominant conformation and e.e. value were also determined .