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- Disubstituted polyacetylenes 双取代聚乙炔
- That polyacetylenes are present in flames has been demonstrated many times. 已多次证实火焰中存在聚乙炔。
- The prefixes cis and trans are frequently applied to disubstituted cycloalkanes. 词头顺和反常用于双取代的环烷烃。
- For a disubstituted complex, MA4B2, the planar arrangement gives three isomers, the familiar ortho, meta, and para arrangements of organic chemistry. 对于双取代络合物MA4B2,其平面排列有三个异构体,常见的为有机化学中的邻位、间位和对位排列。
- Aryl substituted polyacetylenes and their derivatives exhibit a lot of novel optical, electric, magnetic properties. 芳基取代聚炔及其衍生物呈现出光电磁等许多新颖的性能。
- The configuration of transition state is like as a trans disubstituted three cycle. 过渡态构型类似一个二取代的反式三元环结构.
- Two disubstituted benzocrown ethers have been synthesized by two methods with pyrocatechol, their compositions and structures have been characterized. 以邻苯二酚为原料,采用不同的方法合成了两种双取代苯并冠醚,并进行了结构表征,确认其组成。
- A series of disubstituted monoamides extractants were synthesized and their extracted species with uranyl nitrate were obtained by extraction method. 合成了系列双取代单酰胺萃取剂,利用萃取方法获得了与硝酸铀酰的萃合物。
- A type of chiral molecular tweezers has been designed and synthesized by using diphenic acid as spacer and chiral unsymmetrically disubstituted urea as arm for the first time. 以联苯二甲酸为隔离基,手性不对称脲为手臂,设计合成了一类新型的手性分子钳。
- It was found that the enantioseletivities of chiral dendritic disubstituted bis(oxazoline) catalysts were superior to that of chiral dendritic mono-substituted catalysts. 结果表明,树状分子双取代的手性双恶唑啉催化剂的对映选择性高于树状分子单取代的手性双恶唑啉催化剂。
- Disubstituted 1,3,4-oxadiazoles are widely used in the agriculture and industry of medicine and material because of their various biological and optical activities. 摘要2,5-二取代-1,3,4-恶二唑类化合物因其具有独特的生物活性和光学活性而广泛被人们研究,并被应用在农业、医药、材料等多个领域。
- The method includes carrying out a reaction of urea with a variety of substituted amines under the mild reaction conditions to prepare disubstituted urea. 采用尿素与各种取代的胺,在温和条件下反应制备二取代脲;
- A series of unsymmetrical disubstituted ureas were prepared by reaction of trichloroac-etanilide to different amines in the presence of in organic base. 以无机碱作催化剂,用三氯乙酰苯胺与不同的胺反应,合成了8种不对称取代脲。
- Sulfur compound types of mercaptan, thioether, and tetrahydro-thiophene in gasoline were easily be removed by adsorption desulfurization, but disubstituted thiophene was difficult. 吸附脱硫工艺中,硫醇、硫醚、四氢噻吩类化合物最易脱除,受空间位阻的影响,取代噻吩比噻吩难脱除;
- Tweleve disubstituted diphenylthiourea compounds were designed and synthesized.Their powder SHG tests shown that three of them have effect of SHG.The strongest is six times of KDP. 本文设计合成了十二种二取代二苯硫脲类化合物,粉末测试表明其中三种化合物具有倍频效应,最大者为KDP的6倍。
- Progress in studies on naturally occurring polyacetylenes 天然聚乙炔醇类研究进展
- Study on synthesis of unsymmetrical aromatic disubstituted ureas 不对称芳香取代脲的合成
- Keywords panax ginseng;polyacetylenes;ginsenosides;constituent analysis; 人参;多炔类化合物;人参皂苷;成分分析;
- N'- ( disubstituted pyrimidinyl) -N-cinnamoyl thiourea N'-(二取代嘧啶基)-N-桂皮酰基硫脲
- Keywords substituted polyacetylenes;femtosecond luminescence dynamics.; 关键词聚乙炔衍生物;飞秒发光;动力学;