苯基的

The auxiliary can be recovered in high yield (81%) only by filtering and recrystallization. Besides, some other aldehydes have been chosen to test the enantioselectivity of N,N\'-dibenzyl tartamide, in comparison with two other allylaborates reagents developed previously by Roush and Brown, respectively. The results show that %e.e. of homoallylic alcohol is superior to that of the former, and approaches the Brown reagent.

产物经S_N2反应得瑞格列萘中间体-甲基烯丙基-2-氯苯基-叠氮甲烷(17)；同时，将筛选出的新型手性配体N-苄基酒石酸二酰胺用于其他几种醛(正丁醛，异戊醛和环己醛)的不对称烯丙基化反应，并与广泛应用的Roush配体(22)和Brown配体(27)相比较，发现其立体选择性优于Roush配体，并接近Brown配体，但明显具有可回收利用的优势。

The 24 h-LC50 of triphenytin to Chironomus plumosus larve,Galba pervia and Tubifex tubifex were 278.7,249.1,287.8 μg·L-1,respectively.The 7 d-KBCF of Chironomus plumosus larve to TPT at 5 and 10 μg·L-1 was 60.4,70.5,respectively.

结果表明，三苯基锡对羽摇蚊幼虫、小锥实螺、颤蚓的24 h-LC50分别为278.7、249.1、287.8μg.L-1；羽摇蚊幼虫在5、10μg.L-1TPT时的7 d-KBCF分别为60.4、70.5；小锥实螺在10、20μg.L-1TPT时的7 d-KBCF分别为2 648、1 377；颤蚓在10、20μg.L-1TPT时的7 d-KBCF分别为41.7、48.7。

Aim: To determine whether activation of κ-opioid receptor with U50,4 88 H, a selective κ-opioid receptor agonist, produces any changes in electrical u ncoupling during prolonged ischemia and whether these changes in electrical unco upling is associated with the cardioprotection induced by κ-opioid receptor ac tivation, and to explore the possible mechanism.

测量指标：以分光光度计在490nm波长下测定氯化三苯基四氯唑与活细胞反应的产物formazan含量的方法测定心肌细胞活性、测定冠脉流出液中乳酸脱氢酶的含量以及心室内压；②全心停灌70min，应用四电极法观察不同浓度U50，488H、nor-BNI和5-HD对缺血期间心肌整体阻抗和电脱耦联参数(电脱耦联时间、平台时间、电脱耦联最大速率和阻抗倍数)的影响。

The synergistic extraction of uranyl nitrate with binary system of 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 and tributyl phosphate or diphenyl sulfoxide, and ternary system of PMBP-DPSO-TBP were studied.

本文研究了1-苯基3-甲基4-苯甲酰吡唑酮-5与磷酸三丁酯或二苯亚砜的苯溶液从硝酸介质中对U的萃取，实验发现有显著的二元协萃效应，并测定了二元协萃络合物的组成为 UO_2A_2·TBP或 UO_2A_2·DPSO，求得二元协萃平衡常数为1gβ_(12)=3.58，1gβ_(13)=3.61。

In the photolysis of 9, phosphine dissociation is followed by addition of HCl yielding the neutral vinylidene complex Cl[Ru1]=C=CHC(CCl3)2 10, [Ru1] = Cp

当进行光裂解错合物的反应时，在加入氯化氢分子的状况下，产生一个中性的钌金属亚乙烯基错化合物Cl[Ru1]=C=CHC(CCl3)2 10， [Ru1] = Cp(PPh3Ru 并且伴随著一个三苯基磷分子的离去。

The influence of different substituent positions and different lengths of the alkoxy chain on the supramolecular systems of the water-unsolvable alkoxyphenylporphyrin with CD of different cavity diameters was also discussed.

在此基础上，探讨了不同取代位置、不同链长的烷氧基对非水溶性烷氧基苯基卟啉与不同空腔直径的环糊精的超分子体系的影响。

A compound 2-(3-hydroxyphenyl)[60] fullerene pyrrolidine was synthesized by the 1,3-dipolar cycloaddition reaction of the fullerene(C60) and azomethine ylide (prepared from glycine and 3-hydroxybenzaldehyde). The product was characterized by UV-Vis,1H-NMR ,FT-IR and MS. The reaction conditions affecting the yields of product were investigated and the optimum reaction conditions with product yield 75%(based on consumed C60) were:molar ratio of C60∶3-hydroxybenzaldehyde:glycine 1∶3∶6,reaction temperature 95℃,reaction time 18h.

利用甘氨酸和3-羟基苯甲醛与C60发生1， 3-偶极环加成反应，合成分离得到了2-(3-羟基苯基)[60]富勒烯吡咯烷，用UV-Vis、1H-NMR、FT-IR、MS等测试手段表征了产物的结构，并通过单因素方法，探讨了反应条件对产物产率的影响，得到最佳工艺条件：反应物摩尔比1∶3∶6，温度95 ℃，反应时间18 h，产物的产率可达75%（以消耗的C60计）。

The results indicate that there is an important relationship between the substructures of butyrolactone in taiwanin A and its biological activity, we find that the enlargement of structure space at the place of methylene of piperonyl group of taiwanin A may be a way to improve its biological activity.

我们发现taiwanin A结构中的内酯﹝butyrolactone﹞与生物活性有著密切关系，另外还推测它次甲基二氧苯基﹝piperonyl group﹞上的次甲基如果能用空间上更大的官能基取代，是改进taiwanin A生物活性的一个方向。

The chemical structure of the product was characterized by means of the melting point and IR. The results show that tetraethylammonium bromide which was used as a phase transfer catalyst in this reaction had optimization effect on the interfacial diffusive reaction of BTC and PNP. Higher concentration of sodium hydroxide, lower temperature and a higher dosage of BTC produced a small amount of 4-nitrophenyl chloroformate, while lower concentration of sodium hydroxide and a lower dosage of BTC made reaction incomplete, which affected the yield.

结果表明，在碳酸二（4-硝基苯基）酯合成中使用的相转移催化剂四乙基溴化铵对受界面扩散控制的BTC气与对硝基酚钠反应有良好的相转移催化效果；氢氧化钠质量分数较低时，酚钠盐向溶有BTC的油相扩散速度较小，较高时会产生氯甲酸对硝基苯酯；温度较低、BTC量较高时，会产生少量氯甲酸对硝基苯酯，BTC用量较低会使反应不完全，这些都影响着收率。

The slices were divided into two groups. In group I, the slices were perfused with 5-HT(subscript 2A) receptor excitomotory-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane dissolved in modified Kreb's solution. In group Ⅱ, the slices were perfused with ketanserine specific antagonist of 5-HT(subscript 2A) receptor. The effects of DOI and ketanserine on RRDA were observed.

标本分2组：第1组使用含5-HT(下标 2A)受体特异激动剂2，5-二甲氧基－4-碘苯基丙烷的Kreb's液灌流脑片，观察其对RRDA的影响；第2组使用含5-HT(下标 2A)受体特异拮抗剂酮舍林的Kreb's液灌流脑片，观察其对RRDA的影响。

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。