羟基

It is suggested that the scission is preceded by an aldol condensation, followed by a phenolic hydroxyl participation with scission of the C---C in the β-hydroxy-ketone formed.

经推论这一断键反应首先是发生羟醛缩合，继以在酚羟基参与下引发烷羰C－C键断裂的；还应指出，也是由于对位羟基的参与，这些烷基对羟苯基酮不形成它们的乙醇缩酮。

The paper studied the scavenging active oxygen radicals of brown pigment from chestnut shell. The results showed that the brown pigment had scavenging effects on hydroxyl radical, superoxide anion radical and aliphatic radicals on lipid-peroxidation. In the range of test concentration, the maximum scavenging or inhibition rate of the brown pigment to hydroxyl radical generated by Fenton reaction, superoxide anion radical generated by illuminating riboflavin system and linoleic acid auto-oxidation was 83.0%, 82.1% and 88.5% respectively.

从清除羟基自由基和超氧阴离子自由基、抗脂质过氧化以及还原能力等方面对板栗壳棕色素的抗活性氧自由基进行了试验研究和评价，结果表明：板栗壳棕色素对Fenton反应产生的羟基自由基和光照核黄素产生的超氧阴离子自由基均具有较强清除作用，对脂质过氧化过程中产生的脂自由基和脂过氧化自由基有明显的抑制作用，且在试验浓度范围内，其最大清除率或抑制率分别可达到83.0%、82.1%和88.5%。

The structural characteristics of the ligand of the chiral Schiff base are that the ligand has phenol hydroxyl, alcoholic hydroxyl and an imine group, one to three bromine atoms are provided on the framework of double benzene nucleus, and chiral carbon is connected with the nitrogen atom of imine.

手性西佛碱配体的结构特征为含有酚羟基、醇羟基和亚胺基团，在萘环骨架上带有一至三个溴原子，手性碳与亚胺的氮原子相连。

A novel type of photoalignment material based on the esterification reaction of 3,5-dihydroxyl benzyl alcohol and cinnamoyl chloride was firstly reported in this paper. The distinct property of this material is the nonlinear branch conformation and its polarity end with hydroxyl group.

通过在3，5-二羟基苯甲醇分子中的双酚基基团上引入双肉桂酰酯光敏基团的酯化反应，合成了一类新型的分子顶部为羟基极性基团，整个分子构型类似于树枝状的光敏小分子化合物。

Carbons 1 and 2 are substituted by fatty acids and carbon 3 by phosphorylcholine.

在1位和2位碳原子上的羟基被脂肪酸取代，3位碳原子上的羟基被磷酸胆碱取代。

In chapter 3, general reaction of a-hydroxy epoxides were introduced. We have developed a newly gold-catalyzed ring opening reaction ofα-hydroxy epoxides containing carbon cycle. We have disclosed the rule of ring opening reaction. And the plausible mechanism was proposed.

第三章：首先介绍了α-羟基环氧化合物的反应，其次介绍了一个新的金催化的含碳环骨架的α-羟基环氧化合物开环反应，总结了反应规律，提出了可能的反应机理。

Characteristics: According to the principle of forming acnes and furuncles, the product which contains oil-controlling genes, can quickly remove the bacteria on the surface of furuncles and get rid of remaining oil and dirt by soaking into the skin deeply.

主要成份：鲸蜡醇、硬脂醇、对羟基苯甲酯丙二醇、对羟基苯甲酸丁酯等。产品特性：针对痤疮、暗疮的形成原理，采用控油因子，迅速清除痤疮表面细菌，并渗透至肌肤深层，排出残余油脂和污物。

Moreover, the suggestions on development of domestic glycollic acid in the future are put forward also.

最后对羟基乙酸在国内外的生产现状进行分析，并对国内羟基乙酸今后的发展提出几点建议。

To evaluate the allelopathy effects of benzoic acid and ρ-hydroxybenzoic acid on watermelon, this paper studied the effects of benzoic acid and ρ-hydroxybenzoic acid on watermelon seed germination and seedling growth by seed soaking, seed-bud soaking and seedling irrigation.

为探明苯甲酸、对-羟基苯甲酸对西瓜的化感作用，采用浸种、浸芽和浇灌幼苗的方法分别研究了苯甲酸、对-羟基苯甲酸对西瓜种子发芽和幼苗生长的影响。

The thermal behavious and structure of p(hydroxybenzoic acid/2-hydroxy-6-naphthoicacid)polyarylate /polyester blend fibers were investigated by means of DSC thermal analysis.

利用热分析的方法对聚（对羟基苯甲酸／6－羟基－2－甲酸萘［p（HBA／HNA］／聚对苯二甲酸乙二酯共混纤维的结构进行了研究。

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。