查询词典 chalcone

Key words: ornamental plants and horticulture; molecular breeding; transgenic chrysanthemum; genetic stability; cross breeding; chalcone synthase gene

关键 词：园林植物与观赏园艺；分子育种；转基因菊花；遗传稳定性；杂交育种；查尔酮合成酶基因

In the presence of 1b,1c,or 1d(5%,molar fraction),chalcone was stereoselectively epoxidized by sodium hypochlorite with yields range from % to 92% and ee range from 58% to 63%.

以次氯酸钠为氧化剂时，化合物1b、1c和1d可不对称地催化查尔酮的环氧化反应，ee值58%~63%，产率%~92%。

Meanwhile, the β-cyclodextrin- modified chiral amine salt also exhibited the chiral inducibility in asymmetric epoxidation of chalcone.

通过共价键负载于β-环糊精的手性胺在查尔酮的不对称环氧化反应中也显示出立体诱导作用。

New flexible ligand derived from this achiral biphenylbackbone was applied in Cu-catalyzed enantioselective 1,4-conjugate additionsof Et_2Zn to chalcone.

进一步衍生得到的非手性联苯型P，N 配体，在Cu催化Et_2Zn对查耳酮的1，4-共轭加成反应中也进行了考察。

In the Cu-catalyzed enantioselective 1,4-conjugate addition of diethylzinc to acyclic enones, the reaction conditions, such as the amount of diethylzinc, solvents, temperature and the reaction time, were investigated in detail with 9a as the standard ligand and chalcone as the typical substrate.

考察了Et_2Zn量、溶剂、反应温度和反应时间等因素对反应的影响，得到了配体与Cu的摩尔比为2.5、1.5倍Et_2Zn用量、甲苯为反应溶剂、-20℃下反应6小时为不对称催化1，4-共轭加成的优化反应条件。

Flavonoids, derivatives of chromone or chromane, are built upon a C6-C3-C6 flavone skeleton in which the three-carbon bridge between the phenyl groups is commonly cyclized with oxygen. There are diverse group of plants containing flavone, isoflavone, flavonol, chalcone, ect.

黄酮类化合物系色原烷或色原酮的衍生物，其基本骨架具有C_6—C_3—C_6的特点，即指两个苯环通过中央三碳链相互连接而成的一系列化合物。

The correlations of eleven floral and fruit quantitative traits of Liriodendron interspecific hybrids(L. chinense×L. tulipifera) and its parent species were analysized.The aglycone and glycoside of flavonoid and carotinoids of perianth segment in the three groups were studied qualitatively and quantatively by high performance liquid chromatography.The results were as followed: The aglycone such as cyanidin, 6-hydroxyflavone and trans-chalcone and the glycoside such as glucose, rhamnose and galactose were discovered in Liriodendron interspecific hybrids and Liriodendron chinense,carotinoids such as lycopene and β-carotene were also discovered.

本文对鹅掌楸、北美鹅掌楸和杂交F_1的花果共11 个数量性状进行分析，并应用高效液相色谱对上述三大类群花被片类黄酮糖苷配基和结合糖及类胡萝卜素进行了定性和定量研究，结果如下：鹅掌楸和杂交鹅掌楸花被片类黄酮糖苷配基为花青素、6-羟基黄酮和反式查尔酮，糖苷配基结合糖为葡萄糖、鼠李糖和半乳糖；类胡萝卜素为β-胡萝卜素和番茄红素。

In addition, a chalcone derivative was synthesized as fluorescent and colorimetric chemosensor for anions such as F~- and AcO~-.5. Mesoporous SQ/SBA-15 on the basis of the interaction of squaraine dye and mercaptol was designed and synthesized.

设计合成了一个查尔酮化合物5，加入碱性较大的阴离子后，紫外可见吸收光谱和荧光光谱均发生变化，有望发展为荧光和生色双功能阴离子传感器。5。

Aldol condensation 2, 5-dimethoxymethoxyacetophone with 2, 4, 6 -tri methoxymethoxybenzendehyde, then hydrogenation, reductive, the key intermediate 83 (84) of natural product 3, 5, 7, 2′, 5′- pentahydroxyflavan, was obtained; Mini reviewed EGCg activity, Then gallic acid and phloroglucin were used to synthsis EGCg, The key intermediate Chalcone 109 of EGCg was abtained through 7 steps from gallic acid.

重点介绍了以没食子酸为原料，经酯化，保护，还原，氧化，格氏反应，氧化六步反应得到3，4，5-三苄氧基苯乙酮，以间苯三酚为原料，经维斯迈尔反应，苄基保护，甲氧甲氧基保护三步反应得到2，4-二苄氧基-6甲氧甲氧基苯甲醛，酮106与醛108经羟醛缩合得到EGCg重要反应中间体查尔酮109。

Chapter III We try to synthesizing pyrazole by hydrazine and thiourea in alkaline conditions, we found we can not get the acyl pyrazole in the conditions of synthesizing succinylthydrazine and ferrocenyl chalcone, pyrazole was got instead.

第三章我们尝试以酰肼及氨基硫脲作为氮源在碱性条件下来合成吡唑类化合物，并取得了理想的结果。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。