氧氢基

In this disseration, the cationic ring open-polymerization mechanism of THF、 butylene oxide and ethylene oxide were studied on the basis of electronic microstructures by using quantum chemicl method.

本文选取四氢呋喃、环氧丁烷和环氧乙烷的阳离子开环聚合为研究对象，运用量子化学方法从微观层次上对烷氧基化开环聚合过程进行了较为全面的研究。

Their structures were characterized as dihydroconiferyl dihydro-p-coumarate, vanillin, apocynin, p-hydroxybenzaldehyde, syringaldehyde, syringic acid, syringylethanone,α-hydroxypropiosyringone, coniferyl aldehyde, dihydroconiferyl alcohol, 2-hydroxyphenylpropanol, and 3-hydroxy-4-methoxy-phenylethanol, respectively.

结果 从该植物中分离得到12个酚性化合物，其结构分别为二氢松柏醇二氢对羟基桂皮酸酯，香草醛，罗布麻宁，对羟基苯甲醛，丁香醛，丁香酸，丁香乙酮，α-羟基丁香丙酮，松柏醛，二氢松柏醇，2-羟基苯丙醇和3-羟基－4-甲氧基苯乙醇。

Mn-complexes in which Mn atom ligand with the N atom within ligand can stimulate the recovery of electron transfer and oxygen evolution. The trinuclear Mn-complex is extremely sensitive to the addition of CaCl2. It is suggested that there is an interaction between Ca2 and carboxyl within the trinuclear Mn-complex during photoactivation and this interaction benefits the ligation of Mn atom to the apo-WOC and form an active WOC. Binuclear MnMn complex shows slightly higher efficiency than binuclear MnMn complex in restoration of O2 evolution activity. It is suggested from our results that recovery of electron transport and O2 evolution with synthetic Mn-complexes is affected by different factors. Cl- can stimulate the reconstitution of WOC at the concentration of over 100mM;the maximal recovery of O2 evolution activity requires the presence of CaCl2 and 33 kDa protein polypeptide together. Bicarbonate can stimulate the reconstitution of WOC.

锰配合物中锰原子与配体中的氮原子配位连接时，能显著恢复电子传递活性和放氧活性；三核锰化合物在重组时对CaCl2的存在非常敏感，我们认为Ca2 与三核锰化合物中的羧基之间存在一定的相互作用，而这种作用有助于锰原子的光配位进而使三核锰化合物易于组装成有活性的水氧化复合物：双核锰化合物MnMn比双核锰化合物MnMn在恢复放氧活性方面更有效；影响锰化合物电子传递能力恢复的因素与影响锰化合物放氧活性恢复的因素不同；在锰蔟重组过程中，氯离子的浓度必须在100mM以上，才能有效进行光重组；最大光重组效率的获得必须有钙离子和33kDa多肽同时存在；碳酸氢根离子促进锰化合物与去锰光系统II的光组装。

New sulfonyloxadiazolones have the formula, in which A stands for hydrogen, sulphur,-SO-,-SO2- or a group, in which R stands for hydrogen or alkyl; R stands for optionally substituted cycloalkyl, cycloalkenyl or aryl; and R stands for optionally substituted alkyl, alkenyl, dialkylamino or aryl.

本发明涉及式新的磺酰基__二唑酮，其中，A代表氧、硫、－SO－、－SO 2 －或基团，其中R 3 代表氢或烷基；R 1 代表任选被取代的环烷基，任选被取代的环烯基或任选被取代的芳基；和R 2 代表任选被取代的烷基，链烯基，二烷基氨基或芳基。

Results:From the extraction of 95% in the green peel of Juglans Mandshurica,we got five compounds,which were respectively:β-sitosterol;juglone;3,5-dimethoxy-4-hydroxybenzoic acid;regiolon;succinic acid 4-oxyethyl-5-hydroxide-β-tetralone;...

结果：从核桃楸的乙醇提取物中分离鉴定了5个化合物，分别是：β-谷甾醇；胡桃醌；3， 5-二甲氧基-4-羟基苯甲酸；regiolon；琥珀酸；4-乙氧基-5-羟基-β-四氢萘酮；胡桃酮。结论：化合物Ⅲ、Ⅶ、Ⅵ为首次从核桃楸青皮中分离得到，Ⅶ、Ⅵ为新的天然化合物。

The largest chemical shifts were observed for the proton 1.48 ppm adjacent to the central pyridinium ring and para-protons 1.47 ppm with respect to the nitrogen of pyridinium.

在最终的亲核加成化合物2-F的芳香族区中的这些化学位移与9，10二氢-9-甲氧基-9-(4甲氧基苯基)-10-甲基吖啶的对应物是一致的，17b 这被证明是与过量的MeOH形成的9-苯基吖啶盐的加成化合物（支持信息中的图S7）。

A novel method combining a conventional free-radical solution polymerization with a chemical saponification was used to synthesize a, cu-dicarboxyl terminated oligo s with molecular weight below 1500. Here, cn-carboxyl terminated oligo s were firstly synthesized by the free-radical polymerization in THF, where 4,4'-azobis(4-cyanovaleric acid) was used as initiator, thioglycolic acid as chain transfer agent, then CTBMA were transformed into di-CTBMA via saponifying CTBMA in dioxane/H_2O/KOH solution.

利用传统自由基聚合法，在四氢呋喃溶液中自由基引发聚合甲基丙烯酸丁酯单体而得到w-羧基-甲基丙烯酸丁酯低聚物(分子量在1500左右)；利用CTBMA 末端酯基的反应特性，在二氧六环／水／KOH混合溶液中皂化CTBMA，使之转化为a ，w-羧基甲基丙烯酸丁酯低聚物；研究了溶剂的类别、反应时间等反应条件对皂化产物结构的影响；利用MALDI-TOF-MS及LSIMS对皂化各阶段产物进行了分析监测。

The recent research progress of oxidation carbonylation of amines/β-amino alcohols, alkoxycarbonylation of epoxides, carbonylative Suzuki coupling, carbonylative Sonogashira, and double carbonylation of aryl iodides has been presented, focusing on the carbonylation reactions studied by us in the past few years, with 81 references.

综述了胺／氨基醇类化合物氧化羰化、环氧化合物氢酯基化、碘代芳烃的羰化Suzuki偶联、羰化Sonogashira以及双羰基化等重要羰基化反应的研究状况，特别是结合本课题组近年来在该领域中的工作，并对羰基化反应的发展及应用前景进行了展望。

Have carried on testing service for nearly 200 hazardous substances, including Asbestos, PAHs, Phthalates, NP/NPEO, AZO, CFC/HCFC/Halons, PVC, PCB, PCT, PCN, CP, Mirex, TPT/TBT/TBTO, Formaldehyde, Heavy metals, can help your products in fully compliance with 'green purchase' request of international buyers.

开展除RoHS以外的近200种有害物质检测业务，包括石棉、多环芳烃、邻苯二甲酸盐、壬基苯酚/壬基苯酚乙氧基化合物、偶氮染料、氟氯烷烃/氢氯氟烷烃/海龙、聚氯乙烯、多氯联苯、多氯三联苯、多氯化萘、短链氯化石蜡、灭蚊灵、三苯基锡类/三丁基锡类/二的氧化物、甲醛、重金属等，涉及范围完全满足各国际买家的&绿色采购&要求。

These complexes showed modest catalytic activity, and the PDIs of the polymers obtained were relatively broad.6. Reaction of CpjLn with MBMPHa in THF in 1 :1 molar ratio, isopropanol was added to the system in 1 equiv., after workup, a new kind of neutral lanthanide complexes [LnCw-OiPrXTHF2]2 Ln = La (14, Nd (15),Yb (16) were gained.

配合物cp3Ln与MBMPH：按卜1的摩尔比在THF中反应1小时，然后再原位按卜1的摩尔比加入异丙醇，合成了中性的桥联双芳氧基稀土烷氧基配合物 [L城犷0，P以THF2]2Ln=La(14，Nd(15)，Yb(16)，产物经红外光谱，元素分析和核磁共振氢谱(配合物14)等表征。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。