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苯甲基

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A new convenient synthesis of a series of 1-aryl-2-propanones using aromatic amines as precursors, via diazo reaction and improved Meerwein arylation reaction under mild conditions, was achieved. In addition, 1-[3,5-bisphenyl]-2-propanone is a new compound among the synthesized compounds. This approach is an efficient synthetic method for the aryl-propanones with the different substituting groups.

以芳香胺为原料,经重氮化和改进的Meerwein芳基取代反应,合成了一系列的1-芳基-2-丙酮,其中1-(3,5-二三氟甲基苯基)2-丙酮是一个新化合物改进后的方法简化了合成步骤,提高了收率,可方便地用于在苯环上具有不同取代基的芳基丙酮的合成。

Ephedrine is both the raw material for medicine and the precursor for making methamphetamine (" ice" drug).

麻黄素既是制药原料,又是制造甲基苯丙胺前体。

A chiral phase transfer catalyst, N-benzyl quinine bromide, was synthesized from natural chiral compound. And 2,5-bimethyl-4-(3-nitrobenzene)-1,4-bihydrogenation pyridine-3--4-methyl formate (viz. nitrendipine) was synthesized by this chiral phase transfer catalysis, and characterized by elemental analysis, infrared spectrum,1H nuclear magnetic resornace, and X-ray single-crystal diffraction.Key words: ammonium; chiral phase transfer catalyser; crystal structure

通过对天然手性物质进行修饰合成手性相转移催化剂N-苄基溴化奎宁,并对目标分子2,5-二甲基-4-(3-硝基苯)-1,4-二氢吡啶-3-甲酸乙酯-5-甲酸甲酯进行不对称催化合成,并通过红外光谱和核磁共振氢谱对化合物进行了表征,用X射线单晶衍射法测定了该化合物的晶体结构。

Objective A multiresidue method based on solid-phase extraction andgas chromatography with electron capture detector was developed for thesimultaneous determination of 15 pesticides (Dichlorvos, Dimethoate,Parathion-methyl, Malathion, Parathion, Fenpropathrin, Lambda-cyhalothrin,Cypermethrin,Esfenvalerate,Deltamethfin,Quintozene,Dieldrin,Heptachlor,α-Endosulfan,β-Endosulfan) in drinking water.

目的:建立同时检测饮用水中15种农药残留的固相萃取-气相色谱分析方法,所检测的农药包括5种有机磷:敌敌畏,乐果,甲基对硫磷,马拉硫磷,对硫磷;5种有机氯:五氯硝基苯,狄氏剂,环氧七氯,α-硫丹,β-硫丹;5种拟除虫菊酯:甲氰菊酯,三氟氯氰菊酯,氯氰菊酯,氰戊菊酯,溴氰菊酯。

Cellulose, mannitol, hydroxypropyl methylcellulose phthalate, citric acid, sodium starch glycolate, glyceryl triacetate, modified cellulose gum, stearic acid, colloidal silicon dioxide, titanium dioxide and yellow ochre.

纤维素,甘露醇,羟丙基甲基纤维素邻苯二甲酸酯,柠檬酸,淀粉钠乙醇,三醋酸甘油酯,改性纤维素胶,硬脂酸,胶质二氧化矽,二氧化钛和黄赭色。

In addition, pesticides can also abnormal sperm, and lead to miscarriage, stillbirth, birth defects, such as benomyl, DBCP, methylmercury, such as epoxy heptachlor.

另外,农药也可使精子异常,而导致流产,死胎、新生儿缺陷,如苯菌灵、二溴氯丙烷、甲基汞、环氧七氯等。

Isolated PBMC were separated from 5 mL venous blood in asepsis condition. NF-κB stimulator, NF-κB inhabitor and astragalus were added into the different tubes of PBMC, respectively.

抽取所有研究对象5 mL静脉血并提取PBMC,分别加入NF-κB刺激剂IL-1β、NF-κB抑制剂对甲苯磺酰-L-苯丙氨酸氯甲基酮及黄芪注射液。

This paper reported the synthetic method of polymethine styrylcyanines from benzotellurazolium iodides.

本文首次报道了由苯并碲唑季铵碘盐合成多次甲基苯乙烯菁的方法。

In the second section, we described CuI/L-proline-promoted cross-coupling reaction of aryl iodides with activated methylene c-ompounds.

本论文分为两部分,第一部分为手性胍离子液体的制备及性质表征;第二部分为CuI/L-脯氨酸催化的芳基碘苯和活泼亚甲基化合物交叉偶联反应的研究。

"Toluene: Colourless, flammable , toxic liquid hydrocarbon aromatic compound (C6H5CH3), the methyl derivative of benzene."

甲苯:无色、易燃、有毒的液体烃芳香族化合物,是由苯衍生出甲基。

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Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在,所有的孩子都要在综合学校继续学习,所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地,使人们普遍认识到发展不能以牺牲农业为代价。

Detailed Intrinsic Reaction Coordination calculations were carried out to guarantee the optimized transition-state structures being connected to the related tautomers.

同时,做了详尽的内禀反应坐标计算,以保证所得到的过渡态连接相应的始末异构体。