三烯

In comparison with the organic solvents as reaction medium, higher conversion was achieved the tert-ethyl valerate could be formed in the ionic liquid medium.

当反应体系中存在水时，有特戊酸生成。表明反应中2，2，4-三甲基戊烷首先发生β-断裂反应，生成叔丁基正碳离子和异丁烯。

Resveratrol(trans-3,4',5-trihydroxystilbene) is a phytochemical which was synthesized in various plant species such as grapes, Veratrum and Polygonum cuspidatum.

白藜芦醇，化学名称为3，5，4'-三羟基反苯二烯，是一种主要存在于葡萄、藜芦、虎杖等植物中的多酚类化合物。

Via comprehensive computations, the possibilities of vinylidene and allene intermediates were excluded, and the reaction mechanism was found to contain the following three steps:(1) gold-catalyzed cyclization to give the cyclic intermediate,(2) the cyclic intermediate undergoing a 1,3-H migration to give a more stable intermediate, with the assistance of water-cluster,(3) finially, the 1,2-H or 1,2-silyl migration occuring for generation of the observed product.

通过对各种可能的反应路径的进行计算和比较，排除了亚甲基卡宾和连二烯中间体的可能性，并确定该异构化反应机理包含以下三个步骤：（1）炔丙基吡啶反应在金催化条件下发生分子内的成环得到环状中间体；（2）环状中间体在水分子簇的协助下优先发生1，3-氢迁移反应，异构化得到更为稳定的中间体；（3）最后再进行1，2-氢迁移或是1，2-硅烷基团迁移即得到实验中所观察到的环异构化产物。

Rice bran wax to fatty acids and senior wax mainly composed of alcohol, fatty acids are palmitic acid (C16), Gan II acid (C22), wood wax acid (C24), wax acid [26 acid] (C26) and other major components of wax alcohols have wax alcohol (C26), different serine alcohol wax, beeswax alcohol (C30), etc.; also contains alcohol to beeswax (C30), wax alcohol, alcohol wax for different serine The main constituents of unsaponifiable matter and a number of free acid mainly palmitic acid is brown, trace of alcohols, 30, such as carbon six elemene liposome.

米糠蜡以脂肪酸和高级蜡醇为主要成分，脂肪酸中有棕榈酸（C16）、甘二烷酸（C22）、木蜡酸（C24）、蜡酸（C26）等主要蜡醇成分中有蜡醇（C26）、异丝氨酸蜡醇、蜂蜡醇（C30）等；另外还含有以蜂蜡醇（C30）、蜡醇、异丝氨酸蜡醇为主要成分的不皂化物及若干游离酸（主要是棕是棕榈酸、微量醇类、三十碳六烯脂质等。

The aconitic acid-acrylic acid copolymer, itaconic acid homopolymer and polyepoxysuccinic acid which were non-phosphorus scale and dispersing inhibitors were synthesized with the fermentation products citric acid, itaconic acid and maleic anhydride.

以生物发酵产品柠檬酸和衣康酸为主要原料，分别合成了无磷阻垢分散剂丙烯三羧酸－丙烯酸共聚物和衣康酸均聚物，利用马来酸酐合成了聚环氧琥珀酸。

ABSTRACT To study the antibacterial constituents from the fermentation broth of endophytic fungus Penicillium sp. 0935030 from mangrove plant Acrostichum aureurm. The separation procedure was guided by antibacterial bioassay. Seven compounds were isolated and purified by column chromatography, and their structures were identified as cyclo (1), cyclo (2), 1(2Furanyl)1,2ethanediol (3),(3β,4β,22β)olean12ene3,22,23triol (4), mannitol (5), uridine (6), and liquiritigenin (7) by physicochemical and spectral data.

为研究红树林植物卤蕨内生真菌Penicillium sp.0935030发酵物中的抗菌活性成分，采用活性追踪的方法，用多种色谱技术对化合物进行分离纯化，通过理化性质和光谱数据鉴定出7个化合物，分别为：环(1)，环(2)，1呋喃基1，2乙二醇(3)，(3β，4β，22β)12烯3，22，23三羟基齐墩果烷(4)，甘露醇(5)，尿苷(6)和甘草素(7)。

While investigating Pd-catalyzed cross-coupling reactions between alkenyl halides and azides to yield vinyl azides, 1 H -1,2,3-triazoles were obtained as the main product.

在调查钯催化交叉偶联反应之间烯卤化物、乙烯产量叠叠，1小时-1，2，3-三唑为主要产品均获得。

This paper contains three parts: 1 Synthesis of novel titanium complexes; 2 Polymerization behaviors of alkoxyl substituted Cp Titanocenes as catalysts for styrene syndiotactic polymerization; 3 Polymerization behaviors of alkenyl substituted Cp Lanthanocenes as Methyl Methacrylate polymerization catalysts.

中文题名新型茂钛、噁唑啉钛络合物的合成、表征以及茂钛、茂稀土络合物催化性能的研究副题名外文题名 Synthesis，characterization of novel Cp，oxazoline titanium complexes and polymerization behaviors of titanocenes and lanthanocenes 论文作者张浩导师钱延龙黄吉玲学科专业应用化学研究领域\研究方向金属有机与均相催化学位级别博士学位授予单位华东理工大学学位授予日期2003 论文页码总数148页关键词金属有机化学稀土络合物噁唑啉类钛络合物茂钛络合物馆藏号BSLW /2003 /O627 /27 本论文包括三部分内容：1）有机金属钛络合物的合成；2）烷氧基取代茂钛络合物催化苯乙烯间规聚合的研究；3）烯基取代茂稀土络合物催化甲基丙烯酸甲酯聚合的研究。

Reduction of 2-bromodifluoromethyl substituted propargyl vinyl ether afforded the difluorovinyl propargyl ether, which rearranged to the corresponding allene bearing a gem-difluoromethene in the mid-aliphatic chain.

第三部分，在碱性条件下，α-氟烷基乙酸乙酯与炔丙醇反应制备了一系列的氟烷基取代的炔丙基烯基醚，并研究了它的Claisen重排反应，得到了2，4-不饱和的氟烷基酮。

Fullerene is the third allotropic form of carbon besides diamond and graphite, C60 is the representative in the fullerenes.

富勒烯是继石墨，金刚石后出现的碳的第三种同素异形体，其中C60是最典型的一种，由于其独特的结构和性能，使得它在生物，化学，材料，纳米科学等领域显示了巨大的应用潜力。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐