查询词典 derivative

Six ruthenium benzylidene complexes (60-65) containing pyridine derivative ligandsare prepared and three of them are new.

为此，合成了六个吡啶及其衍生物配位的钌卡宾配合物60-65，其中三个是新的。

Based on studies of RCM reaction of 50 and CM reaction ofacrylonitrile with 1-octene or 1-decene catalyzed by pyridine derivative-coordinatedruthenium benzylidene complexes, it can be concluded that ruthenium benzylidene complexwith the more labile dissociating ligand exhibits the higher initial activity and better catalyticperformance.

吡啶衍生物配位的钌卡宾配合物催化含氰基烯烃50闭环交互置换反应和丙烯腈与1-辛烯、1-癸烯交叉交互置换反应表明，催化剂中吡啶衍生物配体越易解离，其初活性越高，催化活性越好。

Benzylidene[1,3-bis(2,6-dimethylphenyl)-4,5-dihydroimidazol-2-ylidene]dichloro(2-methylpyridine)ruthenium (62), benzylidene[1,3-bis(2,6-dimethylphenyl)-4,5-dihydroimidazol-2-ylidene] dichloro(2,4-dimethylpyridine)ruthen ium (63) introduce ortho substituted pyridine as dissociating ligand to weaken Ru-N bondand accelerate dissociation of pyridine derivative ligand through steric hindrance.

在钌卡宾配合物[1，3-二-(2，6-二甲苯基)-4，5-二氢咪唑基]-苯亚甲基-(2-甲基吡啶)-二氯合钌(62)，1，3-二-(2，6-二甲苯基)-4，5-二氢咪唑基1-苯亚甲基-(2，4-二甲基吡啶)-二氯合钌(63)中，邻位取代的吡啶作为解离配体，通过邻位基团的空间效应削弱钌-氮配位键，使配体更易解离，提高了催化剂的初活性。

Betulin, extraction, solubility, betulinic acid, derivative, synthesis

关键字或关键词组：白桦酯醇，提取，溶解度，白桦酯酸，衍生物，合成

X-ray single crystal analysis of a new paramagnetic manganese complex with DTPA-BpABA (a DTPA- bisamide derivative), Mn·4H2O, shows that four oxygen atoms and three nitrogen atoms from the ligand coordinate to Mn cation, forming a seven-coordinate distorted pentagonal bipyramid polyhedron.

采用X-射线单晶衍射法对锰与DTPA-BpABA(DTPA-二酰胺衍生物)形成的一个新的顺磁性配合物Mn·4H2O进行了结构测定。

Experimental principles, instruments and techniques of studies based on selectivity recognition of calix [4] arene derivative complexing with metal ions, especially to some transition metals were described.

阐述了杯[4]芳烃衍生物对金属离子特别是过渡金属离子选择性识别的实验方法和原理。

The canonic OC expansion of the first-order Boolean partial derivative of the OC type logic function was discussed.

讨论了OC型逻辑函数一阶布尔偏导数的规范OC展开式。

Fromylsalicylic, the derivative of salicylaldehyde, is an important organic ligand that can be used to synthesize centrosymmetric polynuclear complexes.

牛磺酸是一种含硫氨基酸，它作为一种非蛋白质类氨基酸，是人体必需的重要氨基酸之一，其独特的生理、药理功能，决定了它在医药、食品、化工等方面有着广泛的应用。

The results show that, the chalcone moiety of this CD derivative was located in the less polar CD cavity in the aqueous solution and a"self-inclusion"complex was formed which gave a higher fluorescence emission.

并对上列体系在外界环境极性变化过程中多元配合物的形成和解离；不同醇类化合物因极性与尺寸上的差别而给包结行为带来的影响、进而显示出光谱行为的变化等进行了深入的研究和讨论。

The factors affect on the degree of substitution of product, yield and apparent viscosity, such as the mol rates of EPTAC with -NH2, reaction temperature, reaction time and the content of water in system have been discussed in detail. FTIR spectrometer and UV spectrometer are used to characterize the structure of the derivative and it is proved that substitution reaction mainly occurs on the -N element .The particle size and morphology of chitosan and quantemary ammonium salt of chitosan are analysised by comparing photos of their scanning electron microscope. The degree of substitution of HACC is determined by acid -base conductometric titration. An error in current formula of DS has pointed out and a correct formula has presented.On the base of experience of above experiment, the reaction conditions of HACC were systematically investigated through orthogonal design, and then the best conditions are found. Water-solubility and dependence of pH are studied.

壳聚糖和环氧丙基三甲基氯化铵在异相条件下发生反应，通过单因素实验，制备了一系列不同性能的壳聚糖季铵盐，本文首次详细讨论了反应条件(反应摩尔比、反应时间、反应温度、水含量)对产率及产物性能的影响；用红外光谱和核磁共振对结构进行表征分析时，发现季铵盐阳离子基以N位上取代为主；通过电镜图片对壳聚糖和季铵盐衍生物外观形貌进行对比，采用酸碱电导滴定法测定产物的取代度，并对常用取代度公式做了修正。

In contrast to the ubiquitous rising-sun-with-rays military flag of the Japanese, Chinese banners and ensigns feature a range of designs.

与遍地都是的太阳军旗不同，中国人的旗帜和徽章设计得各式各样。

From their small corner of Feng's Guangzhou headquarters -- a jumble of pink leashes, squeezable rubber steaks, and plastic doggy Santas for Fido's stocking -- Soleil's designers come up with at least five new products a month.

从Feng 设在广州总部的产品展示柜台上可以看到，Soleil的设计师每月至少设计出5件新产品。