碳环的

Write the structural formulas for a cyclic alkyne hydrocarbon with the fewest number of C's which has a meso stereoisomers.

答：写出有内消旋体的且含有碳原子数最少的环炔烃，给出内消旋体的结构式，并命名这些化合物

In this novel cyclization, nucleophiles very regioselectively attack the internal C1′alkyne carbon of enediynes to give benzene derivatives as a single regioisomer.

在这新的环化，亲核攻击非常regioselectively内部C1'alkyne碳的enediynes给予苯衍生物作为一个单一的regioisomer 。

Effects of the position of benzene ring on the carbon chain were also studied.

所以从理论上说，带附加基团苯环连接在靠近烷基链中间位置的长碳链烷基苯磺酸盐有可能是理想的驱油用表面活性剂的趋向。

This dissertation divides into seven chapters and the main contents and conclusions are listed as following:1. Three series binuclear lanthanide carboxylate coordination polymers 1～7 have been synthesized under hydrothermal conditions by altering the length of carbon chains between carboxyl group and phenyl ring on ligands, which are isophthalic acid, 1,3-phenylenediacetic acid and 1,3-phenoxydiacetic acid, and lanthanide ions such as Pr~(3+), Eu~(3+)and Ho~(3+).

论文共分七章，主要研究内容和结论如下：1、通过改变间苯二甲酸配体的羧基和苯环之间的碳链长度，从间苯二甲酸、间苯二乙酸到间苯二氧乙酸，以及改变稀土离子半径Pr~(3+、Eu~(3+)和Ho~(3+)出发，在水热条件下制备了三个系列双核金属单元的稀土羧酸二维配位聚合物1～7。

On the basis of molecular topological diagram's adjacency matric, an edge branch index of cycloalkane has been developed.

将Randic的碳原子支化度修正为边支化度，并在分子拓扑图的邻接矩阵基础上构建环烷烃的边支化度指数。

The results indicate that the carbon and the oxygen in the —COOH group,and the nitron in —2—NH group come into formation of different large π bonds with the benzene rings,and there is a dihedral angle of 63.2° because of place blocking and conjugate effect.

结果显示，该分子羧基的碳氧原子、磺酰胺基的氮原子与苯环形成不同的离域大π键，空间位阻效应和共轭效应使两个苯环不在同一平面，二面角为63.2°。

The broth dilution method was used to determine MICs of fluoroquinolones against the QnrS-positive isolates. The accumulation of ciprofloxacin and the effect of efflux pump inhibitor, carbonyl cyanide m-chlorophenyl hydrazone for tested isolates of E.coli were measured by a fluorescenece method.

采用肉汤微量稀释法测定QnrS阳性株对氟喹诺酮类药物的MIC，荧光测定法检测盐酸环丙沙星在QnrS阳性株体内浓度的变化及能量抑制剂碳酰氰间氯苯腙对菌体内药物蓄积的影响。

The molecular structure of 9,9 '-spiral Spirobifluorene has a very characteristic , which has two planar aromatic structure .they were connected through the only carbon atom and form the mutually perpendicular and structural stability of the cross-plane.

9，9'-螺双芴的分子结构非常有特点，两个具有平面结构的芳香环，通过唯一的碳原子连接构成相互垂直、结构稳定交叉平面。

An intramolecular α-addition of hydroxy or amine-substituted electron-deficient alkyns catalyzed by phosphines was developed.

主要工作是利用我们小组发现的全碳1，3-偶极子在合成螺环化合物方面做了比较细致和深入的研究。

Analyses of spectroscopic and crystal structural data of iridium complexesIr(PR3)Cl and the Vaska's complex reveal that NHC ligands and phosphines have a similar donating ability toward Ir metal center.

并且从光谱分析及晶体结构数据发现[Ir(PR3)Cl]的错合物与Vaska's 错合物相当类似。因此，我们推论其含氮杂环碳烯与膦化物在ㄧ价铱金属上有相似的配位能力。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。