查询词典 bond rating

The facts influencing the high stereoselectivity were discussed. It is proposed that the stability of the tri- molecular transition state or the stereoelectronic effect of the vinyl anion intermediate formed by the nucleophilic addition of halide anion to the electron-deficient carbon- carbon triple bond might be responsible for the high Z-stereoselectivity.

通过对影响反应的高立体选择性因素的研究，认为反应的三分子过渡态的稳定性或生成的烯基负离子中间体的立体电子效应决定了反应的高度Z立体选择性。

The results indicate that isomers P≡C-BH2 and CH3-C≡P containing C≡P triple bond are thermodynamically the most stable species in BH2-C≡P and CH3-C≡P systems, respectively.

结果表明，含C≡P三键的异构体BH2-C≡P和CH3-C≡P在各自的体系中分别是热力学最稳定的结构。

Advances in Research on Plants Reactions under Phosphate Starvation;2. Topics discussed in this article includes synthesis and structures of R2M24, the reactions of its metal-metal triple bond with various reagents such as nucleophiles, carbon-carbon mu.

本文对一类重要的ⅥB族金属叁键化合物R_2M_2_4(R为环戊二烯基及类环戊二烯基)近年来的研究成果进行了综述，综述重点是这类化合物的官能团M≡M参键的化学活性，全文包括R_2M_2_4的合成及结构，M≡M叁键与亲核试剂、与碳-碳重键，与氧或与金属羰基物等试剂的反应及其应用。

It occurs at the carbon-carbon triple bond in a highl regioselective manner. Therefore, the reaction not only expanded the synthetic applications of Diels-Alder reaction but also provided a facile and efficient synthetic procedure for the synthesis of 4-functionalized quinoline derivatives.

上述反应实现不仅扩展了Diles-Alder反应在有机合成的应用，同时喹啉类化合物4-位上官能化的二硫缩烯酮基团也为其4-位取代打开了大门，为合成各种4-取代喹啉类化合物开辟了一个简洁高效的方法。

Topics discussed in this article includes synthesis and structures of R2M24, the reactions of its metal-metal triple bond with various reagents such as nucleophiles, carbon-carbon mu.

本文对一类重要的ⅥB族金属叁键化合物R_2M_2_4(R为环戊二烯基及类环戊二烯基)近年来的研究成果进行了综述，综述重点是这类化合物的官能团M≡M参键的化学活性，全文包括R_2M_2_4的合成及结构，M≡M叁键与亲核试剂、与碳-碳重键，与氧或与金属羰基物等试剂的反应及其应用。

The change in the spectral features of SER spectra detected at more negative potential revealed that an addition reaction occurred with the carbon-carbon triple bond of phenylacetylene.

电化学现场光谱研究表明，苯乙炔分子随电位负移，碳碳叁键被加氢还原。

8Fluorinated carbon-carbon triple bond formation.

8含氟碳-碳叁键的合成方法学。

In Chapter V,the writer put a model forward concretely for bond pricing under time-lag credit risk.

第五章&时滞信用风险下可违约债券的定价&中，笔者给出了具体的债券定价模型，其方法属于简化式方法。

Effects of centrifuging processing and viscosity on the loading content of slurry on the sponge and macrostructure of porous ceramics were studied. The structure and bond strength of the reticulated porous ceramics were also reported.

借助流变测量和光学显微镜观察了挂浆工艺及浆料粘度对泡沫体挂浆量和多孔结构的影响，并对制品材料的微观结构和性能进行了表征。

Treasury bond = T.B.

n 国库卷；长期国库卷

Alternatively, the con- trollers can use the synchronous rectifier itself or loss- less inductor current-sensing methods to provide overload protection with lower power dissipation.

另外，康威特罗勒斯可以使用同步整流器本身或亏损减少电感电流检测方法，以提供低功耗过载保护。

Mr. Dauber's other Schatz hangs in his home movie studio.

多伯把沙兹的另一件作品挂在家里的电影室。