查询词典 oxo

Withbimetallic μ-oxo alkoxide as initiator, the homopolymerization of MG follows atypical living process.

以双金属烷氧化合物为引发剂，MG单体的聚合遵循经典的活性聚合过程。

The monomer reactivity ratios of lactides weredetermined with 〓 as catalyst or bimetallic μ-oxo alkoxide as initiator.

在辛酸亚锡和双金属烷氧化合物引发体系中，分别测定了交酯类单体的竞聚率。

Homogeneous catalytic oxidations of organic substrates such as alkane and alkene catalyzed by m-oxo-bismetalloporphyrins and flexible alkoxyl oxygen linked-bismetalloporphyrins were introduced,and the catalytic mechanism of these two bismetalloporphyrins,along with the possible synergetic catalysis mechanism of binuclear central metal were discussed.

主要介绍了μ-氧代双核金属卟啉和以柔韧烷氧链相连的双核金属卟啉作为仿酶催化剂在均相催化烷烃、烯烃等有机底物氧化方面的研究进展，并对这两类双核金属卟啉的催化机理、金属双核的协同催化作用机理作了论述，最后展望了双核金属卟啉仿酶催化剂的研究前景。

In the presence of ethanol- HCl solution, arylamine-HCl and w=37% aqueous formaldehyde solution or the condensation product of arylamine and formaldehyde are directly reacted with ethyl 3-oxo-2-phenylmethylenebutyrate to form l-aryl-2-phenyl-3-carbethoxy-4-piperidone.

2－苯亚甲基－3－丁酮酸乙酯与芳香胺和w＝37％甲醛水溶液或芳胺和甲醛的缩合物在氯化氢－无水乙醇存在下可直接发生的Mannich反应，得到1－对位取代芳基－2－苯基－3－羰乙氧基－哌啶－4－酮。

The experiments also show that adding NaHSO3 into the reaction liquid of hydroxylation reaction can inhibit the catalytic effect of benzoquinone and residual catalyst on the phenolic tars formation caused by oxo-condensation of the diphenols and therefore reduce the tars formation of the diphenols in the reaction solution.

在羟基化反应液中加入亚硫酸氢钠可以抑制对苯醌和残留催化剂对苯二酚氧化缩合生成焦油的催化作用，从而减少了反应液中苯二酚的生焦反应。

Direct competitions of intramolecular C - H insertions into benzylic C - H and 4-nitroor 4-methoxy substituted benzylic C - H of methyl 2-diazo-3-oxo-6-(4-substituted phenyl)-4-(2-phenylethyl)hexanoate 44a and 44b catalyzed by Rh-mediated carbenoid were alsoinvestigated, and the relative reactivities obtained by compound 44a or 44b were comparableto those obtained by indirect method.

此外，还研究了Rh催化分解下，对位硝基取代或甲氧基取代的4-(2-苯基乙基)-6-(4-取代苯基)-2-重氮基-3-氧代己酸甲酯44a、44b苯甲位C-H插入反应的相对速率，与化合物47a和47f得到的结果比较，数据平行。

Therelative rates of the Rh-mediated carbenoid insertion into the benzylic C - H bonds of aseries of para-substituted phenyl substrates: methyl 2-diazo-3-oxo-6-(4-substituted phenyl)-4-propylhexanoate 47a - g, have been measured by an indirect intramolecular competitionmethod under the condition in which the possible steric and conformational effects have beenminimized.

为了将立体因素和构象因素最大程度减小，以便较为准确地评价电子效应对该反应的影响，设计并合成了不同对位取代基的化合物4-丙基-6-(4-取代苯基)-2-重氮基-3-氧代己酸甲酯47a-g，并研究了它们在不同Rh催化剂作用下的分子内C-H插入反应。

Aiming to investigate its structure and catalytic mechanism, oxo-bridged binuclear iron complexes were researched as the structure models.

为了认识其结构和催化机理，具有类似酶结构的氧桥联双核铁配合物被应用为其结构模拟酶。

Nm~3,μ= 4.836 mm~(-1), F(000)= 677, R = 0.0403, wR = 0.0673. Both of the complex adopt distorted trigonal bipyramidal geometry, with the basal plane defined by the SS atoms of the tridentate ligand and the oxo-group. The N of the tridentate ligand and the S of the monodentate ligand occupy two apical positions. Ionization of the sulphur atoms leads to a neutral compound.

0403，wR = 0.0673。配合物的两个部分均采取扭曲的三角双锥几何结构，基底面由三齿配体的两个硫原子与氧原子构成，三齿配体的一个氮原子和单齿配体的一个硫原子分别占取两个顶角位置，硫原子的离子化致使配合物呈电中性。

Oxo-(4-solanesylaminophenyl)retinoate was successively synthesized from 13-cis-retinoic acid and solanesol by oxidation, bromization and esterification.

以异维A酸和茄尼醇为原料，经氧化、溴化、酯化等一系列反应合成了4-羰基异维A酸(4-N-茄尼基氨基苯酚)酯，其结构经1H NMR，IR和MS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。