查询词典 pyridine

The emphasis was on chemical properties,application,main production methods,market,and prospects of main deriva- tives of acetaldehyde such as ethyl acetate,pentaerythritol,glyoxal,peracetic acid, crotonaldehyde and pyridine.

介绍了国内外乙醛及其主要衍生物的生产技术发展及其市场供需状况，尤其对乙醛主要衍生物乙酸乙酯、季戊四醇、乙二醛、乙醛酸、丁烯醛、吡啶的化学性质与用途、主要生产方法、市场供需状况及开发前景作详细介绍和分析。

An unusual intramolecular nucleophilic reaction of α carbon anion of crotonate was discovered and the imidazo[1,5 a ]pyridine derivatives were sythesized with a novel tandem reaction.

发现 5 咪唑甲醛(1)与γ溴代巴豆酸酯(2 )在弱碱条件下首先进行亲核取代反应生成 3，继而生成γ碳负离子并转移到α位，然后进行分子内亲核进攻成环、脱水生成 4的串联反应。

In the second approach, terephthalaldehyde was also used as starting material, which reacted with cyanoacetic acid in pyridine to afford tetra-nitrile compound.

在第二种合成路线中，我们仍然以对苯二甲醛为起始原料，对苯二甲醛与氰基乙酸反应得到四氰基化合物8，再经过官能团转换、还原、亲核取代、分子内Friedel-Crafts反应得到中间体H〓TTPR。

In order to further understand combining characteristic of cyclohexyl methylphosphonofluoridate and isopropyl methylphosphonofluoridate and contribute more scientific data for its medical protection, the potency of inhibition of acetylcholinesterase activity induced by GF, GF+GB and the effects of reactivation by oximes pyramidoxime monohydrate(HI-6) and pyridine-2-aldoxime methylchloride(2-PAM-Cl) in rat brain were investigated with DTNB microanalysis in this study.

为进一步了解甲氟膦酸环己酯与甲氟膦酸异丙酯的联合特性，为制订医学防护措施提供更多的理论依据，用微量DTNB法对GF，GB和GF与GB混合对大鼠脑乙酰胆碱酯酶的抑制及肟类重活化剂酰胺磷定（HI-6）和氯磷定（2-PAM-Cl）的重活化作用进行了研究。

The types and kinds of medical intermediate compounds thiaphenol series, pyridine series, cyclopentanone derivant etc.

医药中间体（噻酚系列、吡啶系列、环戊酮衍生物等）品种多样，产品质量保证，深受广大客户好评。

Contrast experiments showed that the "water type trajectory" would be obtained with the promoter of water structure, and "pyridine type trajectory" would be obtained with damager of water structure. They would be related to the strength of electromagnetic field radiation in natural surroundings.

对比 实验表明产生这两类导电轨迹的原因是由于物质对水的结构有促进能力和破坏能力两种不同功能所造成；而电导率持续变化的原因则可能与自然环境某些电磁辐射场强度的持续变化有关连。

It was suggested that China must find a reasonable route from the catalytic hydrogen or electroreduction process to prompt the research and development of pyridine derivatives.

建议从催化加氢还原或电化学还原过程中找到一条合乎国情的工艺路线，以推动我国吡啶系列产品的研发工作。

Two novel A-it-A' type benzothiazole-based derivatives with benzothiazolyl, phenyl-acetyl or pyridine cation groups as π electron acceptor, diethenylphenyl as π conjugated bridge: 4-(2-benzothiazolyl) ethenylchalcone (1) and 4-{4-[2-(benzothiazole-2-yl) ethenyl] styryl}-N-methylpyridinium iodide (2) were synthesized.

以苯并噻唑、苯乙酰基和吡啶阳离子为电子受体，二乙烯基苯为共扼桥，合成了两个新的A-π-A'型苯并噻唑衍生物：4-（2-苯并噻唑）－乙烯基查尔酮(1)和4-｛4-［2-乙烯基］苯乙烯基｝－N-甲基吡啶碘盐(2)。

Two novel A-π-A′ type benzothiazole-based derivatives with benzothiazolyl,phenyl-acetyl or pyridine cation groups as π electron acceptor,diethenylphenyl as π conjugated bridge: 4-(2-benzothiazolyl)ethenylchalcone(1) and 4-{4-[2-(benzothiazole-2-yl)ethenyl]styryl}-N-methylpyridinium iodide(2) were synthesized.

以苯并噻唑、苯乙酰基和吡啶阳离子为电子受体，二乙烯基苯为共轭桥，合成了两个新的A-π-A′型苯并噻唑衍生物：4-(2-苯并噻唑)-乙烯基查尔酮(1)和4-{4-[2-乙烯基]苯乙烯基}-N-甲基吡啶碘盐(2)。

The long wave ultraviolet grass green fluorescence function material is synthesized with the p-toluensulfonyl chloride and o-amino benzoic acid as raw materials,pyridine as solvent,and sodium ethoxide as activator.

缑卫军，刘新奇，紫外长波草绿荧光功能材料的合成研究以对甲苯磺酰氯和邻氨基苯甲酸为原料，吡啶为溶剂，乙醇钠为催化剂，合成紫外长波草绿荧光功能材料。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。