查询词典 phenols

The novel synthesis of the 2-hydroxyl α-arylglycines was realized through the Lewis acids promoted Friedel-Crafts reaction of phenols and N-tosyl imino ester in mild reaction conditions.

其中在路易酸TiCl〓促进下，酚类化合物和亚胺酯发生的傅克反应，可较高产率、较高区域选择性的得到2-羟基α-芳香甘氨酸衍生物。

Low-boiling phenols in low-temperature coal tar are important chemical raw materials. For the identification and determination of the individual phenol boiling below 210℃ in the low temperature coal tar, the methods of gas chromatography, liquid-liquid chromatography followed by ultra-violet analysis and fractional distillation followed by infrared analysis were evaluated and compared.

随着煤炼油工业的发展，煤焦油中的酚类，特别是低級酚，作为化工原料的利用很重要，我們应用(1)气液色譜法，(2)液液色譜与紫外光譜法結合及(3)精餾与紅外光譜法結合三种不同方法对210°以前的低級酚进行了各种异构体的成分分析，比較分析結果：三种方法对同一样品进行分析时，最大絕对誤差在2％以内，其中以气液色譜法最为快速，液液色譜法次之，精餾-紅外光譜法費时間較多；但后二种方法所得数据較完全。

The reactivity of the bond can cause problems with discoloration in the presence of phenols in some instances, but this disadvantage would seem to be more than offset by the positive aspects of titanates as coupling agents.

在一些情况下，有酚化合物存在时， TiO 键的活性可能引起变色问题。但是这些缺点似乎可以被钛酸酯作为偶联剂的积极方面所抵消。

The reactivity of the bond can cause problems with discoloration in the presence of phenols in some instances, but this disadvantage would seem to be more than offset by the positive aspects of titanates as coupling agents.

在一些情况下，有酚化合物存在时， TiO键的活性可能引起变色问题。

Plant secondary metabolites are the products of interaction of plant and environment, which including primary compounds of terpenes, alkaloids, flavones, steroids, phenols, etc.

植物的次生代谢物质是植物与环境相互作用的产物，是植物建立起来的用以抵抗植食者及病原菌侵害的化学防御机制。

The inhibition effect of 2,2,6,6-tetramethyl-4-hydroxylpiperidine-oxyl and some phenols and quinones on the AIBN initiated radical polymerization of styrene was studied by using dilatomitry method.

用膨胀计法，研究了2，2，6，6-四甲基-4-羟基哌啶氧自由基及一些醌、酚类化合物对偶氮二异丁腈引发的苯乙烯自由基聚合的阻聚效应。结果表明，当 St在80℃聚合时，加入TMHPO·或TMHPO·-BQ，阻聚效果较为显著。

It can be seen from Table 1 that the residual recalcitrant organics consisted of alcohols (36.68%a),phenols (6.88%),ketonnes,quinines, parafins, nitrogenous and sulfur compounds.

从表1中可见，残余的不易分解的有机物包括了酒精36.68%），长链烷醇混合物(6.88%，酮类、奎宁，石蜡，含氮和硫化合物。

The homogeneous catalysts for selective O-methylation of phenols with DMC are generally organic bases, such as tertiary amines or phosphines, tetrabutylammonium halide and Schiff bases.

酚与DMC甲基化反应的均相催化剂一般选择叔胺、叔膦、季铵盐及Schiff碱等有机碱，多相催化剂为碱金属碳酸盐、沸石、氧化铝及附载有金属盐的氧化铝和煅烧的Mg-Al水滑石。

Phenols are one of the important secondary metabolism products of plants.

酚类物质是重要的植物次生代谢物质之一。

Objective:To explore antioxidant activity of the different substituted phenols.

目的：研究不同取代苯酚类化合物的抗氧化活性。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。