- 更多网络例句与立体异构的相关的网络例句 [注:此内容来源于网络,仅供参考]
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Cephalotaxine ester of 2-oxo-6-methylheptanoic acid was treated with lithium diisopropylamide and Me O-(1-methoxyisopropyl)glycolate to give a mixture of homoisoharringtonine and its stereoisomers with 56% yield. The four stereoisomers separated by TLC showed identical mass spectra and almost superimposed IR but with different 1H NMR spectra. The configuration of the 2'-C and 3'-C of the four isomers were postulated based upon their 1H NMR spectra as compared with the 1H NMR spectra of isoharringtonine and its stereoisomers.
2-氧代-6-甲基庚酰基三尖杉碱(3)与0-(1-甲氧基异丙基)羟基乙酸甲酯(4)在强碱性试剂二异丙胺锂存在下,起亲核加成反应,反应中间体5在室温用酸性丙酮水解,得到一种新的三尖杉酯类生物碱一一高异三尖杉酯碱(6c)及其立体异构体(6a、6b、6d)的混合物,产率56%、通过制备薄层层析分得这四个立体异构体,它们的1H NMR和异三尖杉酯碱及其立体异构体的1H NMR类似,推定了它们的绝对构型。
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A rather more complex case is that of steric isomerism.
更复杂的情形是立体异构问题。
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A solution of one stereoisomer of a given monosaccharide rotates plane-polarized light to the left and is called the levorotatory isomer, designated
一特定单糖的一种立体异构体溶液使平面偏振光向左旋转称为左旋,标记为
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A solution of one stereoisomer of a given monosaccharide rotates plane- polarize d light to the left and is called the levorotatory isomer, designated
一特定单糖的一种立体异构体溶液使平面偏振光向左旋转称为左旋,标记为
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John Cornforth (b. 1917) and Vladimir Prelog (1906-98) shared a 1975 Nobel Prize for work on stereochemistry and stereoisomerism of alkaloid s, enzymes, antibiotics, and other natural compounds.
康福思和普雷洛格在立体化学以及生物碱、、抗生素和其它天然化合物的立体异构方面做了许多工作,因而共获1975年的诺贝尔奖。
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John Cornforth (b. 1917) and Vladimir Prelog (1906-98) shared a 1975 Nobel Prize for work on stereochemistry and stereoisomerism of alkaloids, enzymes, antibiotic s, and other natural compounds.
康福思和普雷洛格在立体化学以及生物碱、、抗生素和其它天然化合物的立体异构方面做了许多工作,因而共获1975年的诺贝尔奖。
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The generating results of our system were compared with the published,results of DENDRAL and SEMAMI systems, and they were consistent with eachother.
目前本系统对于含C、N、P、S与Si等元素由于不对称中心、不对称轴引起的立体异构和几何异构均能进行穷举生成。
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The invention includes all sterioisomeric forms, including individual diastereoisomers and enantiomers of the compound of formula as well as racemic and non-racemic mixtures thereof.
本发明包括式化合物所有的立体异构形式,包括单个的非对映异构体和对映异构体,及其外消旋的和非外消旋的混合物。
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Diltiazem is an important coronary vasodilating drug and contains two chiral centers while only the (2S, 3S)-isomer has the desired activity.
地尔硫卓是重要的心血管药物,在其分子结构中含有2个手性中心,可产生4个立体异构体,其中只有(2S, 3S)-异构体具有药理活性,因此其立体选择性合成具有很大的挑战性。
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The combined acids , LHZZS,XDZZS and SLZZS, one of four fractions in montan resins from montan waxes from Liaohu, Xundian and Shulan brown coal respectively, were derived by CH 2N 2 to methyl esters and their chemical constituents and structural characteristic were studied on GC-MS.
结果显示,树脂结合酸均以正构烷酸为主要成份,其分布为C1 2 ~C2 8,高含量的正构烷酸集中在低碳数一端,C2 0 含量最高,其次为C1 6 ,而舒兰结合酸中,正构烷酸占绝对优势,且C1 6 为最高含量的化合物;去氢松香酸在每一个样品中含量较低,其它三环二萜酸,如松脂酸、三达松脂酸等异构体或立体异构体含量也非常低;具有五环三萜骨架的酸性物质,在潦浒、舒兰结合酸中比较丰富,其含量超过寻甸结合酸;在低碳数一端,存在着各种支链烷酸及苯甲酸、苯酚及取代物。
- 更多网络解释与立体异构的相关的网络解释 [注:此内容来源于网络,仅供参考]
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eclipsed conformation:重叠式构象
构型和构象立体异构(stereo isomery) 分子式和结构式均相同,但立体结构(分子中各原子在空间排列方式)不同而产生的异构.包括--构象异构(conformation isomery)和重叠式构象(eclipsed conformation) 两甲基上的氢原子正处于相互对映的位置,
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stereo isomerism:立体异构(现象)
perspicuous 明白的, 明了的 | stereo isomerism 立体异构(现象) | leukoplania 白细胞游出
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stereoisomer:立体异构体
立体异构体(stereoisomer)是指由分子中原子在空间上排列方式不同所产生的异构体,它可分为顺反异构体,对映异构体和构象异构体三种,也可分为对映异构体和非对映异构体两大类.
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stereoisomerism:立体异构
立体异构(stereoisomerism)是在有相同分子式的化合物分子中,原子或原子团互相连接的次序相同,但在空间的排列方式不同,与构造异构同属有机化学范畴中的同分异构现象.
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stereoisomerism:立体异构体
spectroscopic technique 光谱技术 | stereoisomerism 立体异构体 | stoppered flask 已塞紧的烧瓶
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tactic polymer:有规聚合物;立体异构聚合物
tacky 粘的;有粘性的 | tactic polymer 有规聚合物;立体异构聚合物 | tadpole fish 狗鳕
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alloisomerism:立体异构
allogenic 他生的 | alloisomerism 立体异构 | alloite 脆凝灰岩
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allose:阿洛糖(一种己醛糖,为葡萄糖的立体异构物)
allosaurus | 异龙 | allose | 阿洛糖(一种己醛糖,为葡萄糖的立体异构物) | allosomal inheritance | 性染色体遗传
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epimeral:肢上板的
epimer 表异构物,差向(立体)异构体 | epimeral 肢上板的 | epimerase 差向异构酶
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stereomeric:立体异构的
stereomer 立体异构体 | stereomeric 立体异构的 | stereomeride 立体异构体