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1

Some of the products tested had the U. S. Department of Agriculture organic seal, and none of those contained 1, 4 -dioxane.

有些被检验并且盖有美国农业部有机印章的产品中并没有发现含有 1,4 -二恶烷。

3

One of the typical halogenated aromatic, 1, 4-DCB is choose d as the research target pollutants in this study .

本实验选用卤代芳烃的代表物质 1,4 -二氯苯（1,4-DCB ）作为研究目标物质。

4

These results indicate that the presence of strong acid sites favors the improvement of both phenol conversion and 2, 4-DTBP selectivity .

这表明强酸中心的出现有利于提高苯酚的转化率和 2,4 -二叔丁基苯酚的选择性。

5

The purity of target product was 99% with yield up to 95%.

目标产品纯度 99%，相对于 2,4 -二甲基苯酚收率达到 95%以上。

9

on the anti-allergy-2, 4 Dinitrochlorobenzene (DNCB) in mice induced by the impact of delayed -type hypersensitivity .

抗过敏汤对 2,4 -二硝基氯苯（DNCB ）诱导的小鼠迟发型超敏反应的影响。

10

The dichlorophenoxyacetic acid (2, 4-D) can be detected accurately, rapidly and conveniently by these technologies .

实现 2,4 -二氯苯氧乙酸（2,4-D ）的准确、快速、简便的检测。

11

Catalyzed by 4 -dimethylaminepyridine, vitamin E succinate was synthesized with vitamin E and succinic anhydride .

以 4 -二甲氨基吡啶为催化剂，以维生素 E 和琥珀酸酐为原料合成维生素 E 琥珀酸酯。

12

Stamens 4, didynamous, inserted on distal part of corolla tube, included .

雄蕊 4 ，二强雄蕊，花冠筒的着生于上部，包括。

14

A test was made for determining various aldehydes and their respective contents in the hydrophobic adhesive by 2, 4-DNPH-HPLC method .

介绍采用 2,4 -二硝基苯肼 -高效液相色谱法分析测定疏水性胶粘剂中醛类成分和含量的实验。

15

The developments of synthetic methods of 4 , 4 '-diamino diphenyl ether(DADPE)and its re- action conditions were reviewed.

介绍了 4 ,4 ′-二氨基二苯醚合成方法的研究进展，阐述了其工艺条件。

16

4 -Dihydropyrimidin-2(H)-ones have received great attention in organic synthetic chemistry due to their biological importance.

4 -二氢嘧啶酮及其衍生物具有很好的生物活性，因此在有机合成方面引起了人们的广泛关注。

17

Taking p chlorotoluene as raw material , 2 , 4 Dichlorotoluene was synthesized via catalytic chlorination process .

以对氯甲苯为原料，经催化氯化制取 2 ,4 二氯甲苯。

18

Stamens 4, didynamous, included .

雄蕊 4 ，二强雄蕊，包括。

19

Reportedly , the environmental activist group found that Herbal Essences contained 24 parts per million (ppm) of 1 , 4-dioxane .

据报道，环保活动家小组发现草本精华液里含有百万分之二十四的 1,4 -二氧六环。

20

The amounts the OCA found were as high as 97 . 1 parts per million, in a dish liquid .

亚奥理事会发现在一碟液体中 1,4 -二恶烷的含量高达百万分之 97 .

21

PLLA and PEG were treated as one component because they are miscible . the solvent was 1 , 4-dioxane and n-Heptane was the non-solvent.

PLLA 与 PEG 为互溶性高分子，因此可视为一相，而溶剂和非溶剂则分别为 1 ,4 二氧陆圜与正庚烷。

22

Methyl ester of caffeic acid and 3, 4-diacetyl-caffeic acid can cross the BBB and can thus be used as brain targets .

咖啡酸甲酯和 3,4 -二乙酰基咖啡酸能突破血脑屏障具有脑靶向性特点。

24

Formaldehyde in beer was directly distilled and then derived with 2 , 4 -dinitrophenylhydrazine to yield 2 , 4-dinitrophenylhydrazone.

在实验中，首先分别将不同品牌的啤酒常压蒸馏，然后将各自所得馏分与 2.4 -二硝基苯肼进行化学反应。

25

17 out of 28 products tested 61 percent contained both formaldehyde and 1, 4 -dioxane.

28 件被测产品中的 17 件 -61%-同时含有甲醛和 1,4 -二恶烷。

26

Hantzsch 1 , 4 -dihydropyridines (Hantzsch 1, 4-DHP) attract great interest for their importance in organic synthesis and biochemistry.

4 -二氢吡啶类化合物作为一类具有重要生物活性的化合物，引起了人们极大的兴趣。

27

The synthesis of toluene-2, 4-dicarbamate (TDC) from 2 , 4-diamino toluene and dimethyl carbonate is a complex reaction system .

由 2 ,4 二氨基甲苯与碳酸二甲酯制备甲苯 2 ,4二氨基甲酸甲酯为一复合反应体系。

28

Fomesafen was synthesized from 3-methylphenol and 3, 4-dichloro-trifluorotoluene as initiative in this paper.

本实验以间甲苯酚和 3,4 -二氯三氟甲苯为原料合成氟磺胺草醚。

29

METHODS(1) was synthesized by using 3 , 4 -dimethoxyphenylacetonitrile(2) and 2-bromopropane as the starting material with selected PTC.

方法以 3,4 -二甲氧基乙腈和 2 -溴丙烷为原料，筛选相转移催化剂，进行烃化反应得到目标物。

30

Synthesis of 5 -[(4-dimethylaminophenyl) methylene ]-babituric acid in water is reported in this paper.

研究了 5-[（4 -二甲氨基）苯亚甲基 ]巴比妥酸的合成方法，选择了反应的最佳条件。

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