查询词典 in the presence of

While in phenylhydrazine case, the intermediate phenylhydrazone was not active enough for the reaction of intermolecular condensation, unless in the presence of oxidizer, such as cupric chloride.

苯腙可以通过苯肼和α-溴代苯乙酮在没有催化剂存在下反应得到。

In the presence of Pt catalyst, polyhydrodimethylsiloxane reacted with allyl polyoxyethylenepolyoxypropylene ether (F-6) by hydrosilylation to form an intermediate polyether silicone, which further undergo phosphation reaction with phosphorous pentoxide, a kind of phosphate modified polyethersiloxane surfactant was prepared.

采用铂作催化剂，通过含氢硅油和端烯基聚醚（F-6）的硅氢化加成反应先制得聚醚硅油中间体，再将其和五氧化二磷进行酯化反应，制得了一种磷酸酯型有机硅表面活性剂。

It is photocatalytic, meaning that it causes chemical reactions in the presence of light.

它是透过&光触媒&作用，在光线的照射下，产生化学反应。

A reduction-coupling-etherification reaction between aromatic aldehydes or ketones (1) and alcohols ( 2 ) to yield corresponding diether ( 3 ) of pinacol in the presence of tin and chlorotrimethylsilane.

在三甲基氯硅烷、四氢呋喃体系中，芳香醛、酮和醇在金属锡的作用下发生还原-偶联-醚化反应生成相应的频那醇二醚类化合物。

A novel method of the determination of thiram was proposed based on its polarographic catalytic wave in the presence of persulfate.

研究了酒石酸－酒石酸钾钠－K2S2O8体系中福美双的极谱催化波，拟定了测定福美双的新方法。

A catalytic polarographic determination of fenbufen in the presence of K2S2O8 was described.

研究了芬布芬(Fenbufen，FBF)在K2S2O8存在下的极谱催化波。

The novel reaction to create 6,7-dimethoxy-1-(3,4-dimethoxyphenyl)-4-hydroxy-naphthalene 83 in one-pot procedure was found during the synthesis of diphyllin, which started from catechol dimethylether and succinic anhydride and involved heating the molten mixture of the two reactants in the presence of polyphosphoric acid at 140℃.

这个反应是用邻苯二酚二甲醚和丁二酸酐为原料，把两个原料的混合物熔融后，加入PPA，在140℃下搅拌后就会有产物生成。

The corresponding thiochromanones were synthesized from β-arylthioethers of propionic acid under microwave irradiation in the presence of polyphosphoric acid. Their structures were confirmed by IR, 1H NMR, MS spectra and elemental analysis.

关于这些化合物合成曾有一些报道：以硫酚及卤代羧酸为原料在回流或超声作用下合成β-芳硫丙酸，芳硫丙酸在浓硫酸或磷酸作用下环化制备硫色满酮[1，2]。

The species distribution and transformation characteristics of polysilicic acid in the presence of acetic acid were investigated by chemical Si-Mo assay analysis.

针对聚硅酸金属盐絮凝剂因硅酸聚合胶凝而失活的问题，依照Si-Mo比色法的原理，对乙酸存在时的聚硅酸形态及其转化规律进行研究。

Positive: he included mention of a performance by Mrs Bandmann Palmer of LEAH at the Gaiety Theatre, 46, 47, 48, 49 South King street, an invitation to supper at Wynn's Hotel, 35, 36 and 37 Lower Abbey street, a volume of peccaminous pornographical tendency entituled SWEETS OF SIN, anonymous author a gentleman of fashion, a temporary concussion caused by a falsely calculated movement in the course of a postcenal gymnastic display, the victim being Stephen Dedalus, professor and author, eldest surviving son of Simon Dedalus, of no fixed occupation, an aeronautical feat executed by him in the presence of a witness, the professor and author aforesaid, with promptitude of decision and gymnastic flexibility.

积极方面，他谈到班德曼。帕默夫人在位于南国王街四十六、四十七、四十八、四十九号的欢乐剧场扮演丽亚这一角色事；接到将在下阿贝街三十五、三十六和三十七号的怀恩饭店举行的晚餐会请帖；由一位匿名的时下名流所作的一本题名《偷情的快乐》、具有淫秽色情倾向的书；宴会后表演体操，因某个动作失误而造成暂时的脑震荡，受伤者为教师兼作家斯蒂芬。迪达勒斯，他乃无固定职业的西蒙。迪达勒斯仍健在的长子；当着一位目击者，即该教师兼作家的面，他以机敏果断和体操的弹性表演了空中特技。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。