加成物（ 1 ）与卤素反应后，与锡原子相连的苯基被取代，得到一卤代、二卤代和混合二卤代物（2—8） 。
The phenyl groups in compound 1 were substituted by ICl, Br 2 or I 2 to yield mono- and dihalide derivatives(2—8).
方法：以2氨基4 ，5二甲氧基苯甲酸为原料，分别经过环化、氯代、取代等反应，合成了五种目标化合物。
The five quinazoline compounds were prepared by using 2 amino 4,5 dimethoxy benzoic acid as original material, which underwent ring closing, halogenation and substitution.
以2,6 -二氯吡啶为原料，通过硝化，取代，还原，环化，氧化等几步反应可得到目标化合物。
From 2, 6-dichloropyridine as starting material, we can get the target molecule through nitration, substitution, reduction, cyclization, oxidation etc.
所得的三环化合物经热分解和加氢反应，制备顺式和反式- 2,5 -二取代四氢呋喃。
The cis - or trans-2, 5-disubstituted tetrahydrofurans were provided by the hot decomposition and then hydrogenation of tricycle compounds produced.
新型取代的2,4 -噻唑烷二酮衍生物，其制备方法以及含有它们的药物组合物。
Novel substituted 2, 4-thiazolidine diketone derivatives, method for preparation thereof and pharmaceutical compositions containing the same.
结果表明，对邻苯二甲酸酯类化合物而言，取代基的空间结构参数是影响受试物好氧生物降解性能的重要因素。
The result showed that the steric factors of substituents were important parameters affecting the aerobic biodegradability of the tested compounds.
周二，IBM的研究人员称，他们已经研制出了一种使用植物萃取物制成环保塑料制品的方法，这种环保塑料制品将会取代以石油为基础的严重破坏环境的产品。
IBM researchers on Tuesday said they have discovered a way to make Earth-friendly plastic from plants that could replace petroleum-based products tough on the environment.
苯并咪唑及其衍生物的开发，尤其是二取代化合物越来越受到重视，被认为是一类具有多种生物生理活性的杂环。
The development of the benzimidazole and it's derivatives, especially two replacements of benzimidazole, is regarded as a category with a variety bioactivities of heterocyclic.
本发明涉及新的特别由三氟甲基和卤素取代的1，3-二苯基脲，以及它们在药物组合物的制备中作为活性成分的用途。
The invention relates to novel specifically trifluoromethyl and halogen substituted 1,3-diphenyl ureas and their use as active ingredients in the preparation of pharmaceutical compositions.
以溴戊烷、溴己烷、1，2-二溴乙烷和亚磷酸三甲酯为原料，分别合成了戊基、己基、溴乙基取代的三种膦酸二甲酯化合物。
In this paper, three alkyl substituted dimethyl phosphonates have been synthesized by trimethyl phosphite with 1-Bromopentane, 1-Bromohexane and 1,2-Dibromoethane.
目的研究4（2 0 ）双键5 / 7/ 6型紫杉烷类二萜化合物的质谱裂解特征，以及取代基种类及位置对质谱裂解的影响，探讨该类化合物的质谱裂解规律。
AIM To investigate the fragmentation behavior of three 4(20) methylene 5/7/6 type taxoids, and the influence of types and positions of the substituents on fragmentation.
研究三氯化钛存在下邻硝基苯胺与1,2 -二酮在碱性介质中一锅反应，快速方便、高收率地合成了一系列取代喹喔啉化合物。
In this paper, the one-pot reaction of aqueous titanium trichloride with o-nitroaniline and 1, 2-diketone compounds in basic media was studied.
光学活性的2，2'-二取代1，1'-联萘和间吡啶桥构筑的分子内双螺旋化合物的合成。
Synthesis of Intramolecular Double-helical Compound Connecting Chiral 2,2'-Substituted 1,1'-Binaphthyl with meta-Pyridine Bridges.
本文主要论述2，5-二取代-1，3，4-噻二唑类化合物的合成及其在抗腐蚀、抗磨擦、液晶、农药、医药、分析化学等方面的应用。
The synthesis of 2,5-disubstituted-1,3,4-thiadiazoles and their applications in corrosion resistance, anti-friction, liquid crystals, pesticides, pharmaceuticals, and chemical analysis were reviewed.
结果表明，尽管这些二甲基萘的电离能基本相同，但因取代基位置不同使分子中电荷分布不同，从而影响了激基复合物的形成能力。
Although the ionization potentials of dimethyl naphthalenes used was almost the same yet the charge distribution was different due to the different positions of two methyl groups on naphthalene. Th…
经取代的2，4-二氨基-1，3，5-三嗪类化合物、其制备方法及其用作除草剂和植物生长调节剂的用途。
Substituted 2,4-diamino-1,3,5-triazines, methods for the production thereof, and use thereof as herbicides and plant growth regulators.
采用本发明的拆分方法制备单一手性2-杂环取代的 二氢嘧啶化合物的产物收率为20％以上，光学纯度达98％以上；
The splitting method adopted for preparing single chiral 2-heterocycle substituted dihydro pyrimidine compounds has the product yield more than 20 percent and the optical purity above 98 percent;
采用本发明的拆分方法制备单一手性2-杂环取代的 二氢嘧啶化合物的产物收率为20％以上，光学纯度达98％以上；
The splitting method adopted for preparing single chiral 2-heterocycle substituted dihydro pyrimidine compounds has the product yield more than 20 percent and the optical purity above 98 percent;
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