羟基

In SDS-PAC system, the hydroxide groups bridging effect of the polymolecular hydroxide complex ion is the main mechanism of surfactant flocculation.

SDS-PAC体系中，多核羟基络离子在胶束之间的羟基架桥作用，是表面活性剂混凝沉淀的主要机理。

Two compounds have been isolated from hard coral Porites Compressa Dana,their structures were determined by IR,MS, HNMR, 13CNMR analysis.The two compounds are: batyl alcohol,(2) N-[l--2-hydroxyl--3,7-heptadecadienal]- h exadecanamide.

从采自西沙群岛的扁缩滨珊瑚中的石油醚部分分离出两个化合物，经IR、MS、~1HNMR、~(13)CNMR等波谱方法鉴定，其结构分别为(1)鲨肝醇，(2)N-1-羟基甲基-2-羟基--3，7-十七碳二烯基十六酸酰胺。

Ealuation of the exclusie use of calcium or itamin D3 showed no antifracture efficacy for patients receiing 800 IU of itamin D3 per day.44 Howeer, the mean concentration of 25-hydroxyitamin D increased from 15.2 ng per milliliter to just 24.8 ng per milliliter (37.9 to 61.9 nmol per liter), which was below the threshold thought to proide antifracture efficacy.8 Porthouse and colleagues,45 who ealuated the effect of 800 IU of itamin D3 per day on fracture preention, did not report concentrations of 25-hydroxyitamin D.

对单独服用钙或维生素D3的评价显示，每天服用800IU维生素D3没有抗骨折效果。平均25-羟基维生素D浓度从15.2ng/ml仅上升到24.8ng/ml(37.7到61.9nmol/l)，但仍低于认为可以产生抗骨折作用的阈值。Porthouse及其同事评价了每天800IU维生素D3对预防骨折的作用，并没有报道25-羟基维生素D浓度。

β-（3,5-Diterbutyl-4-hydroxyphenyl） propionyl chloride is synthesized with 3,5-methyl propionate as raw material via hydrolytic reaction and replacement reaction,and the replacement reaction conditions were explored.

摘 要：以β-（3，5-二叔丁基-4-羟基苯基）丙酸甲酯为原料，通过水解反应和酰氯合成反应合成了抗氧剂中间体β-（3，5-二叔丁基-4-羟基苯基）丙酰氯。

Their structures were characterized by IR, 1H NMR, of which 4-chloro- 2-methyl-7-(2-bromoethoxy) isoflavone, 2, 4\'-dimethyl-7-(2-bromo-ethoxy)isoflavone and 2-methyl-7-(2-bromoethoxy) isoflavone are rarely reported so far.4\'-chloro-2-methyl-7-(3-bromopropoxy)isoflavone, 2, 4\'-dimethyl-7-(3-bromo- propoxy) isoflavone, 2-methyl-7-(3-bromopropoxy) isoflavone, 4\'-methoxy-2-methyl-7-(3-bromopropoxy) isoflavone and 4\'-hydroxy-2-methyl-7-(3-bromopropoxy) isoflavone were gained by reacting 7-hydroxy-2-methyl isoflavone derivatives with 1, 3-dibromo- propane, respectively.

第三章(来源：73ABC论文网www.abclunwen.com)在丙酮溶液中以K_2CO_3为碱，使溴乙氧基异黄酮和溴丙氧基异黄酮与咪唑偶合，以较高的产率合成出10种目标化合物：2-甲基-4′-氯-7-2-(1-咪唑基乙氧基异黄酮、2，4′-二甲基-7-2-(1-咪唑基乙氧基异黄酮、2-甲基-7-2-(1-咪唑基乙氧基异黄酮、2-甲基-4′-甲氧基-7-2-(1-咪唑基乙氧基异黄酮、2-甲基-4′-羟基-7-2-(1-咪唑基乙氧基异黄酮、2-甲基-4′-氯-7-3-(1-咪唑基丙氧基异黄酮、2，4′-二甲基-7-3-(1-咪唑基丙氧基异黄酮、2-甲基-7-3-(1-咪唑基丙氧基异黄酮、2-甲基-4′-甲氧基-7-3-(1-咪唑基丙氧基异黄酮、2-甲基-4′-羟基-7-3-(1-咪唑基丙氧基异黄酮，经IR、~1H NMR、~(13)C NMR、元素分析等对其结构进行了表征，10种目标产物均未见文(来源：ABC论文cccccc网www.abclunwen.com)献报道。

The pyridinium salts was transformed by the base to 1-hydroxy or 3-hydroxy-quinolizinylides, which undergo 1,3-dipolar cycloadditionreaction with alkenes,and then aromatizated to cycl[3,3,2]azinone in thepresence of oxidant.

实验证明，这是一个连续进行的多步反应：2-羰基吡啶鎓盐在反应中先生成1-羟基或3-羟基喹嗪叶立德，然后与烯烃起1，3—偶极加成反应，最后在氧化剂作用下脱氢芳构化而生成Cycl[3，3，2]azinone。

A novel complex of Ni (3-PyOH)4Cl2 (3-PyOH=-pyridone) was synthesized by the reaction of NiCl26H2O and 3-hydroxypyridine in an alcohol solution, and characterized by elemental analysis, IR spectrum and single crystal X-ray diffraction.

利用氯化镍和3-羟基吡啶在乙醇溶液中反应得到了配合物Ni(3-PyOH)4Cl2（3-Pyon=3-羟基吡啶），并对其进行了元素分析、红外和单晶X射线的表征。

Results: Nine compounds were obtained from the ethyl acetate fraction of C. speciosa and were identified as methyl chlorogenate, 5-O-cafeoyl quinic acid butyl ester, quinic acid butyl ester, 5-hydroxymethyl-furan-2-carbaldehyde, triacontanoic acid,-epicatichin, 7,8-dihydroxy-coumanrin, protocatechuic acid ethyl ester, and protocatechuic acid.

结果：从皱皮木瓜的乙酸乙酯萃取部位分离鉴定了9种化合物，分别为绿原酸甲酯，5-O-咖啡酰基－奎宁酸丁酯，奎宁酸丁酯，5-羟甲基－2-糠醛，三十烷酸，-表儿茶素，7，8-二羟基香豆素，3，4-二羟基苯甲酸乙酯，原儿茶酸。

The hydroxyl group is usually ortho directing but in the case of salicylaldehyde, the chlorine stom enters para to the hydroxyl group and not in the other ortho position.

羟基通常是邻位的指挥羟基的帕拉和不是另一邻位的在自己的位置上但是氯stom在水杨醛的情况上登记。

The electronic structures and reactivity of Sesbania GumSG_(n=1～5 were studied by the semi-empirical quantum chemistry method, PM3 of HyperChem7 procedure.

用HyperChem7的PM3方法计算了田菁胶(SGn=1～5)的电子结构，讨论了稳定构象、侧链内旋转势能面及羟基氧和羟基氧负离子的反应活性。

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。