甲基溴

In the presence of alkalinity and tetraethyl ammonium bromide, 2,4-dihydroxy benzophenone reacts with allyl glycidyl ether to form an ethylenic derivative of benzophenone, 2-hydroxy-4-(β-hydroxy-γ-allyloxy) propyloxy benzophenone, which can further undergo hydrosilylation with polyhydromethylsiloxane.

在相转移催化剂四乙基溴化按作用下，利用2，4-二羟基二苯甲酮与烯丙基缩水甘油醚在碱性水溶液中的开环加成反应，合成了中间体4-丙氧基－2-羟基二苯甲酮，将其进一步与聚甲基氢硅氧烷进行硅氢化加成反应。

20% Hydrobromic acid was selected as the optimum condition for O-demethyltion. A total yield raised 59.90% was obtained.

采用20%的氢溴酸作为去氧甲基化试剂的新工艺，收率高、成本低、操作简便，适合规模生产。

Results The synthesis condition was improved. The method of methane sulfonic acid/DL-methionine was found an ideal substitute of BBr3 for less cost. While using hydrobromic acid, the O-demethylation and hydrolyzation could be combined in one stage.

结果 优化了纳洛酮的合成工艺，甲磺酸／DL-甲硫氨酸法试剂价格低廉，可降低生产成本；而氢溴酸法不但试剂价格更低，还可将去氧甲基化和水解合并为一步反应，使新工艺的总收率提高到59.90%，产品质量符合中国药典。

The hypochlorous acid and hypobromous acid contained in this bactericide bear extremely strong membrane diffusing-penetrating ability for the absence of charge so as to kill pathogens rapidly.

&甲基利&高效植物病害杀菌剂是一种高效广谱、内吸、治疗型杀菌剂、所含的次氯酸分子和次溴酸分子不带电荷，有极强的扩散穿透细胞膜能力，可迅速将病原体杀死，适用于作物各个生长期，特别对各种真菌性、细菌性和病毒性的疑难病害有独特的铲除效果。

Ab initio and density functional theory (B3LYP) in G98 were employed to study the following four direct aldol reactions between acetone and isobutyraldehyde or 3,3-dimethylbutyric aldehyde or benzaldehyde or 4-bromo-phenyl aldehyde catalyzed by-proline .

中文摘要：本文采用G98程序包中的从头计算方法和密度泛函方法计算研究了-脯氨酸催化丙酮与异丁醛、3，3-二甲基丁醛、苯甲醛及对溴苯甲醛的不对称直接羟醛缩合反应，共计四个反应体系。

Three series of donor-acceptorπ-conjugated molecules 1, 2, and 3 have been designed and synthesized with a N, N-dimethylamino, Julolidine group (2,3,6,7-tetrahydro-1H, 5H-pyrido[3, 2, 1-ij]quinolinyl), or N, N-diphenylamino group as the donor moiety, a phenylvinyl or thienylvinyl unit as the bridge, and a bromide or aldehyde group as the acceptor moiety.

本文设计并合成了1、2、3三个系列的D-π-A型化合物(Donor-Acceptorπ-conjugated compounds)，在化合物分子中引入久洛尼啶基团(2，3，6，7-tetrahydro-1H，5H-pyrido-[3，2，1-ij]quinolinyl)，N，N-二甲基氨基，或N，N-二苯基氨基为供电子基团，以苯乙烯基或噻吩乙烯基为桥链，以溴原子或醛基为吸电子基团。

In present paper, the progress of quinoline derivatives in synthesis and application are summarized first, then according to a lot of literature, designed the synthetic route for 8 derivatives of 6-AQ. They are 4-chloro-6-AQ, 5- chloro -6-AQ, 5-methoxyl-6-AQ, 7- chloro -6-AQ, 8- chloro -6-AQ, 8-bromo-6-AQ, 8-methyl-6-AQ and 8- methoxyl -6-AQ. All the products were obtained by reduction of its corresponding 6-nitroquinoline.

在对过往文献大量查阅的基础上，本文首先综述了喹啉及其衍生物的性质、合成方法及应用研究进展，并通过对文献报道方法的优化和改进成功地设计合成了4-氯-6-AQ、5-氯-6-AQ、5-甲氧基-6-AQ、7-氯-6-AQ、8-氯-6-AQ、8-溴-6-AQ、8-甲基-6-AQ和8-甲氧基-6-AQ等8种6-AQ的衍生物作为研究新型抗疟疾药物的中间体。

Ionic liquid ; selectivity ; bromation reaction ; methylic imidzaole

离子液体；选择性；溴化反应；甲基咪唑

Diethylene gly- col butylmethyl ether was synthesized through the Williamson reaction between butyl bro- mide (n-C_4 H_9 Br) and CH_3 OCH_2 CH_2OCH_2 CH_2 ONa.

通过正溴丁烷与二乙二醇单甲醚钠的Williamson反应合成了二乙二醇甲基丁基醚。

Polystyrene-MMT nanocomposites were prepared by free radical polymerization of styrene containing dispersed clay. The organophilic MMT particles were easily dispersed and swollen in styrene monomer.

采用双－苯基二甲基十八烷基溴化铵作为有机插层剂对钠基蒙脱土进行了有机化处理，该有机化的蒙脱土粒子在苯乙烯单体中很容易地均匀分散并形成稳定的胶体溶液。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。