醚

In chapter three, the activating agents of ytterbium have been examined. Barbier-type reaction promoted by ytterbium metal was examined. The experimental results shown that the yield of Barbier reaction of imines with allylic bromide promoted by ytterbium is higher than that of aldehydes and ketones with allylic bromide under the same reaction conditions. In this chapter, the reductive cleavage of Se-Se and S-S bond induced by ytterbium metal was also studied.

首先研究了金属镱的活化剂以及活化方法，接着考察了金属镱促进的Barbier反应及其在合成高烯丙基胺和高烯丙基醇中的应用，以及影响该反应的主要因素；究了金属镱促进的二硫醚和二硒醚的S—S键和Se—Se键的还原断裂，继而与氯代烃，胺基甲酰氯反应生成相应的硫醚，硒醚，胺基甲酸硫代酯和硒代酯。

In order to explore the relationship between structure and properties of hydroxyalkyl cellulose ether nitrate, molecular structures of nitrate ester of hydroxylethyl cellulose ether, nitrate ester of hydroxylpropyl cellulose and nitrate ester of cellulose glycerol ether with molar substitution of 1 were simulated by using Synthia module of Materials Studio, and their performances of nitrogen content, glass transition temperature and Young's modulus were predicted.

为探索羟烷基纤维素醚硝酸酯的结构与性能关系，借助Materials Studio软件中的Synthia模块模拟了摩尔取代度为1的羟乙基纤维素醚硝酸酯、羟丙基纤维素醚硝酸酯和二羟丙氧纤维素醚硝酸酯的结构，并预测了它们的含氮量、玻璃化转变温度和杨氏模量。

The present invention relates to the depolymering cyclization reaction of aromatic dithio ether polymer to prepare aromatic cyclic dithio ether compound under the presence of mercapto group containing compound and alkali matter.

本发明涉及利用芳香双硫醚聚合物的解聚成环反应来制备芳香双硫醚环状化合物的方法。该方法采用芳香双硫醚聚合物在含巯基的化合物和碱性物质存在的条件下发生解聚成环反应生成双硫醚环状化合物。

The coordination effect between lariat crown ether and lariat azacrown ether with alkali metal ions has been analyzed and compared according to the obtained parameters.

运用得到的量子化学计算参数，如前线轨道HOMO能级，LUMO能级等，对碳基臂式冠醚与氮基臂式冠醚与碱金属离子的配位能力进行了比较和分析，结果表明氮基臂式冠醚分子B对碱金属的配位能力要大于碳基臂式冠醚分子A。

Methods Twenty-four patients scheduled for undergoing thoracoscope operation were divided into two groups of 12 each: desflurane group and isoflurane group. Breathe desflurane or isoflurane before and after one-lung ventilation. And change the I/E to 1:1.5. Recorde inhalation concentration, pulmonum concentration, lung compliance and peak of air tube.

24例拟施胸腔镜手术的病人，随机分为两组，地氟醚组（D组n=14）和异氟醚组（I组n=14），分别在单肺通气前后吸入地氟醚或异氟醚15min，其中单肺通气时吸呼比调整为1.0：1.5，连续纪录吸入浓度、肺泡浓度、肺顺应性和气道峰压。

In chapter four, the preperation of ytterbium diiodide was examined. The reductive cleavage of Se-Se bond and S-S bond induced by ytterbium diiodide was investigated. The reaction of diselenides and disulfides with allylic bromide promoted by ytterbium diiodide was also examined. The intermolecular Barbier-type reaction induced by ytterbium diiodide was studied. In the last section of this chapter, the intermolecular reductive coupling of nitriles with azides induced by samarium diiodide was investigated.

第四章，研究了二碘化镱的制备方法，以及二碘化镱作为一种优良的单电子转移试剂在有机合成中的应用：二硒醚的Se--Se键和二硫醚S-S键的还原断裂，及其在合成烯丙基硒醚，硒代酯和烯丙基硫醚，硫代酯中的应用，实验结果表明二碘化镱也能促进分子间的Barbier反应，而文献认为二碘化镱不能促进分子间的Barbier反应；最后研究了二碘化钐促进的叠氮化合物与腈的交叉还原偶联反应，一步高收率地制备脒的方法。

The chapter two was focused on the samarium diiodide promoted organic reactions and their applications in organic synthesis, firstly, a new synthesis of highly substituted cyclopentadienes from a,β-alkynone promoted by samarium diiodide was investigated and the highly substituted cyclopentadienes were prepared in moderate to good yields under mild conditions. Secondly, the Michael addition and Michael-aldol tandem reaction of diorganyl diselenides or diorganyl disulfides with α,β-alkynones mediated by samarium diiodide were studied and a series of alkenylsulfides and alkenylselenides were prepared in good yields. Then the highly regioselecfive nucleophilic addition of the allylsamarium bromide to α,β-alkynones were explored. We found that the allylsamarium bromide reacts with α,β-alkynones to afford regiospecificly 1. 2-nucleophilic addition products in good yields under mild condition. At last we studied the coupling reaction of aryl halides promoted by NiCl〓/PPh〓/Sm〓.

第二章 研究了二碘化钐、金属钐促进的有机反应：1、二碘化钐促进下α，β-炔基酮的偶联环化反应，提供了一种制备多取代环戊二烯的新方法；2、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮的Michael加成反应，为高产率地制备多取代的烯基硫或烯基硒化合物提供了方便可靠的新方法；3、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮和醛、酮的Michael—aldol串联反应，提供了一种一锅法高产率地制备多取代的含硫的烯丙基醇或含硒的烯丙基醇类化合物的方便可靠的原子经济性的新方法；4、烯丙基溴化钐与α，β-炔基酮的高度区域选择性的1，2-亲核加成反应；5、NiCl〓/PPh〓/Sm〓促进的卤代芳烃的偶联反应-一种从各种卤代芳烃制备联苯类化合物的有效方法。

To test this hypothesis, we measured the effect of IV infusion of the NMDA blockers dizocilpine (MK-801) and-4-(3-phosphonopropyl) piperazine-2-carboxylic acid to decrease the MAC (the minimum alveolar concentration of anesthetic that prevents movement in 50% of subjects given a noxious stimulation) of 8 conventional anesthetics (cyclopropane, desflurane, enflurane, halothane, isoflurane, nitrous oxide, sevoflurane, and xenon) and 8 aromatic compounds (benzene, fluorobenzene, o-difluorobenzene, p-difluorobenzene, 1,2,4-trifluorobenzene, 1,3,5-trifluorobenzene, pentafluorobenzene, and hexafluorobenzene) and, for comparison, etomidate.

为了验证这个假说，我们检测静脉注射 NMDA 阻滞剂 MK-801和 CPP 来降低8种常规吸入麻醉药（环丙烷，地氟醚，安氟醚，氟烷，异氟醚，一氧化二氮，七氟醚和氙）和8种芳香族化合物（苯，氟苯，邻二氟苯，对二氟苯， 1，2，4-三氟苯， 1，3，5-三氟苯，五氟苯和六氟苯的 MAC 值，依托咪酯作为对照组。

It is speculated that this components feedback adjusting the this receptor\'s expression through receptor-binding with 5-HT3A receptor.3.3 Effection of Iridoids composition of Valeriana jatamansi Jones on THP1 mRNA expression of IBS rats induced by chronic stressMethods:Animals were randomly divided into 6 groups:normal group,model group, OSD group,FXT group,MSP group and Iridoids composition of Valeriana jatamansi Jones groups.

表明蜘蛛香环烯醚萜不影响色氨酸羟化酶的转录表达。3.1.3蜘蛛香环烯醚萜对5-HT受体的影响目的：探讨蜘蛛香环烯醚萜对慢性应激所致IBS大鼠5-HT3受体mRNA表达的影响方法：动物随机分为对照组、模型组、昂丹司琼组、氟西汀组、蜘蛛香环烯醚萜24.92mg/kg、12.46mg/kg、6.23mg/kg组，除对照组外，其余各组进行慢性应激实验。

It is speculated that this components feedback adjusting the this receptor\'s expression through receptor-binding with 5-HT3A receptor.3.3 Effection of Iridoids composition of Valeriana jatamansi Jones on THP1 mRNA expression of IBS rats induced by chronic stressMethods:Animals were randomly divided into 6 groups:normal group,model group, OSD group,FXT group,MSP group and Iridoids composition of Valeriana jatamansi Jones groups.

表明蜘蛛香环烯醚萜不影响色氨酸羟化酶的转录表达。3.1.3蜘蛛香环烯醚萜对5-HT受体的影响目的：探讨蜘蛛香环烯醚萜对(来源：ABC论文aaaaaa网www.abclunwen.com)慢性应激所致IBS大鼠5-HT3受体mRNA表达的影响方法：动物随机分为对照组、模型组、昂丹司琼组、氟西汀组、蜘蛛香环烯醚萜24.92mg/kg、12.46mg/kg、6.23mg/kg组，除对照组外，其余各组进行慢性应激实验。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。