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.
三苯基膦被全氟烷基取代基所取代。
Triphenylphosphine has been modified by attachment of perfluoroalkyl substituents.
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.
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.
并对取代基效应作了解释。
本发明涉及取代基戊二酸酐的制备方法。
This invention relates to a preparation method of substituent glutaric acid anhydride.
从而以高收率得到带各种取代基的环丙烷。
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.
各种烷基或卤代烷基取代基结合在碳-25上。
Various alkyl or haloalkyl substitutions are incorporated at carbon-25.
结论甾醇结构中的24位取代基影响甾醇的吸收。
Conclusion 24-substituent of sterol affects the absorption of sterols.
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.
一种含吲哚类取代基的苯并呋喃酮类化合物的制造方法。
The invention discloses a preparation method of a benzofuran ketones compound containing indoles substituent groups.
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.
霍夫曼规则-----主要消除产物是取代基较少的烯烃。
The Hofmann rule----yield mainly the least substituted alkene.
取代基的影响较小，主链共轭结构对吸收光谱的影响明显。
In short, the influence of the substituents is insignificant. However, the remarkable effect was induced by the conjugated structure in the main chain.
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.
并讨论了苯环上不同取代基对冠醚环上各碳化学位移的影响。
The influences of benzine ring's different sub-stituets on the chemical shifts of crown's carbons are also discussed.
大位阻取代基有利于提高对映选择性，但位阻过大降低催化活性。
The large steric hindrance group avails to the enantioselectivity, but too much steric hindrance reduces the activity.
结果表明，大分子链上的氯取代基对分子链进一步氯化起阻碍作用；
The results showed that chloric substituent in polymer chains prevented the chains from further chlorination.
发现了一种简便制备邻位含吸电子取代基的膦酰基杂环化合物的方法。
A simple method of preparation of phosphonic heterocyclic compounds has been found.
本发明涉及通式（I）的化合物，其中取代基如权利要求1中所述。
The invention relates to compounds of formula (I) wherein the substituents are described in claim 1.
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.
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.
此外，还研究了不同取代基和催化剂五羰基合钨对反应机理及反应位垒的影响。
In addition, the catalytic effect of W5 and substitution effect on the reaction mechanisms and reaction barriers have also been considered.
本发明的含有蒽苯甲酮取代基的氟单体及其制备方法和应用属于高分子材料的技术领域。
The invention relates to a fluorine monomer with anthracene benzene ketone substituting group, the preparation method and the application, belonging to the technical field of macromolecular material.
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.
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.
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