羟基化

The osmium-catalyzed asymmetric dihydroxylation of olefins provides one of the most effective methods for the preparation of vicinal diols. Almost all kinds of olefinic substrates can be transformed to the corresponding diols by means of AD reaction. The chiral osmium catalyst is generated in situ by the chiral ligand complexing with OsO〓 in the reaction.

手性锇催化剂催化的烯烃不对称二羟基化反应是合成手性邻二醇最有效的途径之一，可以将几乎所有类型的烯烃转变成相应的手性邻二醇，因此广泛地应用于药物、天然产物以及精细化工产品的合成。

Several types of ligand reactions observed under hydrothermal condition were summed up:(1) hydrolysis of pyridine nitrile, aldehyde and ester in mixed water and alcohol into pyridine-carboxylate;(2) replacement of carboxylate group with sulfonic group;(3) coupling of phenanthroline by dehydrogen;(4) oxidative coupling of methanol into oxalic acid;(5) hydroxylation of isophthalate.

总结了以往在水热条件下观察到的几类配体反应：（1）吡啶腈、醛和酯在醇和水混合溶液中水解成吡啶羧酸；（2）磺基取代羧基反应；（3）邻菲啰啉的脱氢的聚合：（4）甲醇被氧化偶合生成草酸：（5）间苯二甲酸的羟基化反应。

One of the potential advantages of the hypoxia-induced factor prolyl hydroxylase inhibitor approach to anemia therapy over ESA is improved regulation of iron absorption and iron recycling to improve the efficiency of iron utilization, partially via a mechanism of hepcidin suppression, to overcome functional iron deficiency.

用作贫血治疗的缺氧诱导因子脯氨酰羟基化酶抑制剂相对于红细胞生成作用刺激剂的一个优势是铁吸收和铁再利用的调节得到改善，提高了铁利用的效率，尤其是通过铁调节蛋白抑制机制，克服功能性铁缺乏。

From the comparisons of different surface functional groups and different"ink", polyethylene pattered on hydroxyl modified glass slides have achived the best performance among the tested combinations.

通过比较不同基团和不同大分子&墨水&，发现在羟基化的玻璃片上印刷的PEI图案能够比较有效的控制神经元的粘附和突起的生长。

The characterization and tribological properties of samples were conducted by contact angle measuring meter, atomic force microscopy and microtribometer, and the hydroxylation of titanium surfaces by different methods was explored. The effects of load, sliding velocity and ultraviolet radiation on the tribological properties of samples were analyzed.

利用接触角测量仪、原子力显微镜和微摩擦磨损试验机对制备的试样进行表征和摩擦学特性测试，探讨不同方法进行钛金属表面羟基化的作用效果，并分析载荷、滑动速度以及紫外照射对试样摩擦学特性的影响。

The key steps were the stereospecific conversion of both allylie carbamates 10 and 13 into 11 by Li_2Cu_3(CH_2)_5 and the stereoselective hydroxylation of unsaturated side chain by OsO_4-NMO.

合成的关键步骤是用Li_2Cu_3(CH_3)_5立体专一地转化烯丙醇苯胺基甲酸酯10和13成为11和用OsO_4-NMO在化合物16的不饱和侧链上立体选择性羟基化。

These include catechin and gallocatechin (hydroxyls at positions 5' as well as at 3' and 4' as in catechin), their esters with gallic acid, catechin gallate, and gallocatechin gallate, and their epimers.

它们有几茶素和儿茶素(在5'位上以及如同儿茶素中一样在3'和4'位上羟基化)，它们与酸生成的酯，即儿茶素酸酯和儿茶素酸酯，以及它们的差向异构体。

Percents of desorption amounts of Cd 2+ calculated were 70%～100% in red soil and goethite, and 25%～50% in latosols and kaolinite.

Cd2 +在土壤表面的快反应与交换态Cd2 +有关，边面羟基化的键合点位与Cd2 +亲和力的不同是导致Cd2 +解吸速率和解吸量差异的原因。

Thus iron tetrakis porphyrin chloride , chosen as a catalyst in this study, was synthesized, and its solubility and catalytic activity in supercritical propane were investigated.

本研究选择多卤代卟啉铁作为催化剂，合成了四卟啉氯化铁，测定了TPFPPFeCl在超临界丙烷中的溶解度，并且考察了利用空气选择性羟基化丙烷的催化行为。

Two types of three-arm or four-arm star-shaped hydroxy-terminated PCL weresynthesized via the ring-opening polymerization of CL with multifunctional initiator and 〓catalyst.

以多元醇(季戊四醇或2，2-羟甲基丁醇)为引发剂、〓为催化剂，引发CL单体的聚合，合成了端羟基化的三臂或四臂星型PCL聚合物。

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。