三苯基膦被全氟烷基取代基所取代。
Triphenylphosphine has been modified by attachment of perfluoroalkyl substituents.
讨论了气态摩尔标准生成焓与取代基常数间的线性关系。
The linear relationship between the gas phase standard enthalpies of formation and the substituent constants is discussed.
探讨了不同取代基的毒性作用机制。
The toxicity mechanism of different substitutions was discussed.
分析了芳环上取代基对氢重排的影响。
The effect of the substituents on the aromatic ring upon the hydrogen rearrangement was studied.
从而以高收率得到带各种取代基的环丙烷。
根据取代基对各类质子化学位移变化的影响。
On basis of the effect of substituents on the variation of the chem.
本文还讨论了取代基对试剂性能影响的规律。
The rules of the influences of substituents to the properties of reagents were studied.
但若萘环上有取代基，将大大降低其生物活性。
However, any substitution on the naphthyl ring decreased the bioactivity.
讨论了化合物中取代基效应与激光性能之间的关系。
The effects of substituents on laser characteristics are discussed.
芳环上取代基性质对产物分布的可调性具有重要的影响。
The properties of the substituents on aromatic ring would influence whether the product distribution could be controlled conveniently.
所研究化合物的生物降解性主要与取代基的电子效应有关。
It is also shown that the biodegradability of studied compounds is mainly related to the electronic effect of substitute groups.
作者认为影响聚合物等规度的因素主要是取代基的极性效应。
The tacticity of polymers is mainly influenced by the polarity of substituent group of vinyl monomer.
吡啶取代基的大小和空间位阻是影响相互作用方式的关键因素之一。
The size and steric hindrance of substituent of porphyrin is one of the crucial factors to affect the interaction between porphyrins and DNA.
在染料的相同位置引入不同的取代基，常会引起染料光物理性质的变化。
When a dye was introduced by different substituents at the same position of the dye, its photophysical properties can be changed.
这也说明了对于单取代苯衍生物，取代基在致毒作用中可能起重要作用。
It is also showed that substituents could play an important role in the toxic effect of mono-substituted benzene derivatives.
本文研究了联苯取代物双电荷离子2E谱及其取代基效应和靶气压力影响。
A study of doubly charged ion mass spectra (2E spectra), the substituents effect and the target gas pressure deppendence of biphenyl derivitives was presented in this work.
研究表明配位键的强度不仅受取代基R的影响，而且还与环结构的变化有关。
The strength of the dative bond deponds not only on the substituents R, but also on the skeletal structure of the parent ring.
根据紫外可见光谱和荧光光谱的数据，分析了不同取代基对其光谱性质的影响。
Based on UV spectral data and fluorescence spectral data, the effect of different substituents on spectral properties of the three days was presented and discussed.
根据羰基配体取代基的不同，该类簇合物中小分子的移动种类及方式也有所不同。
These clusters show different fluxional behaviour and ligands according to various substituent around the metals of osmium.
由此可以看出，取代基的主本阻碍反应，是反映在违背动力学因素而不是热力学因素。
It follow therefore that the steric blocking effects of substituents are reflected in adverse kinetic, rather than thermodynamic factors.
研究表明，芳醛上取代基不同对卟啉的合成、磺化和试剂的离解平衡等有一定的影响。
It was found that the substituent attached at the phenyl exerted influence on the yields of synthesis, on the experimental conditions of sulphonation and on the acid-base properties of the reagent.
综述了具有不同含氟取代基的氟硅单体合成方法，以及由这些单体制备氟硅油的研究成果。
This paper deal with the research and progress of the synthesis of some fluorosilicon monomer and the corresponding fluorosilicon oil.
结果表明，苯环上取代基的种类及位置对化合物分子的共轭体系及共平面程度有较大影响。
The results indicate that the kind and position of the substituents in aniline ring greatly affected the conjugation system and coplanarity of the products.
本文报导几种具有不同取代基的芳基丁炔醇的合成和苯基丁炔醇在不同催化条件下的反应性能。
The synthesis of a few Aromatic butynols with different substituting groups and reaction of Phenyl butynols under the different catalysis is described in this paper.
对所有共振谱线进行了全面归属，并讨论了不同取代基和环内不同杂原子对化学位移值的影响。
All of the resonance lines were fully assigned and the effects of substituents and heteroatoms in ring on chemical shifts were discussed.
在此基础上讨论了溶液中样品的结构、取代基对其结构、构象的影响和取代基的化学位移规律。
The structure of samples in solution, the influence of R-substitution on conformation, and the rule of R-substituted chemical shifts were discussed.
结果表明，此类磺酰脲类化合物的除草活性与苯环5位取代基的立体结构和电场性质密切相关。
The results show that herbicidal activity is closely related to the steric and electronic properties of the 5-position of the benzene ring.
重点介绍了金属茂的合成方法及环戊二烯环上的取代基、溶剂对合成及分离旋光性金属茂的影响。
The synthesis of metallocene, the effects of substitution in cyclopentadiene ring, reaction medium for synthesis and separation of chiral metallocene have been highlighted.
生测结果表明在吡啶环的2位合适的取代基和丙烯酸酯的3位取代基的体积对除草活性至关重要。
These results indicated that a suitable substituent at the 2-position of pyridine ring and a well-fit group at the 3-position of acrylate were both essential for hi.
生测结果表明在吡啶环的2位合适的取代基和丙烯酸酯的3位取代基的体积对除草活性至关重要。
These results indicated that a suitable substituent at the 2-position of pyridine ring and a well-fit group at the 3-position of acrylate were both essential for hi.
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