The six-membered ring of each kind of metals is the most stable.
三种元素的六员环短-长键交替结构都是各自环簇中最稳定的结构。
Two 7 - membered ring derivatives of S-(-)-2,2'- binaphthyl - diol, were synthesized.
以S-（-）-2，2’-联二萘酚为手性模板分子，合成出了它的两个七元环衍生物。
The result shows that the transition state of the rearrangement reaction has a three-membered ring structure.
结果表明，该重排反应经过一个三元环过渡态。
The obtained results show the isomerization reaction first forms a four membered ring transition state and then the product is got.
研究结果表明该异构化反应先形成一个四元环过渡态而后转变为产物。
Therefore, it is the reducing end and will be in equilibrium with alpha and beta six-membered ring forms, AS described earlier for monosaccharides.
因此如前面单糖部分所述，它是还原性末端。会形成六元环形式的平衡。
The calculated results show that the aza Wittig reaction is a two step reaction, having one four membered ring intermediate on its reaction surface.
计算结果表明该反应是一个二步反应，在反应途径上存在一个四元环中间体。
An epoxide group and an out-ring double-bond are attached to the 11-membered ring. The molecule contains one primary and two tertiary hydroxyl groups.
十一员环上带有一个环氧基和一个环外双键，分子中含有两个叔羟基和一个伯羟基。
Some of the acetone and methanol molecules are formed with such a complex possessed a six-membered ring-like structure involving non-linear hydrogen bond.
一些丙酮与甲醇分子之间形成具有非线性氢键结合的六元环结构。
H atom of phenolic hydroxyl in the ligand was attractive to N atom forming intramolecular hydrogen bond, and a new six-membered ring was formed by the hydrogen bond connection.
配体中酚羟基上的H原子与N原子相吸形成了分子内氢键，并以氢键连接构成了一个新六元环。
The six-membered rings exhibit slightly distorted chair, extremely distorted chair and half-chair conformation respectively, and the five-membered ring exhibits an envelope conformation.
其中六元环分别呈现微扭曲的椅式构象、严重扭曲的椅式构象及半椅式构象；
All transition states, activation energies and potential curves of four possible reaction paths were obtained. It was found that the homolysis of n-no2 bond in five-membered ring is the initial step.
求得可能的四种不同热解反应通道的过渡态、活化能和位能曲线，发现其热解引发步骤为五元环上侧链n—NO2键的均裂。
This article reviews the ring opening reaction of five membered nitrogen containing heterocyclic compounds.
综述了近年来各种五元氮杂环的开环反应及其在有机合成中的应用。
Purine a simple nitrogenous organic molecule with a double-ring structure? A 6-membered pyrimidine ring fused to a 5-membered imidazole ring.
一种简单的含氮有机分子，具一个双环结构——六元嘧啶环融合成一个五元咪唑环。
Purine a simple nitrogenous organic molecule with a double-ring structure? A 6-membered pyrimidine ring fused to a 5-membered imidazole ring.
一种简单的含氮有机分子，具一个双环结构——六元嘧啶环融合成一个五元咪唑环。
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