羟基酮

Result: 5 compounds were identified as eriodictyol (1), 5, 7-dihydroxy-3′, 4′-dimethoxy flavanone (2), oleanolic (3), 5, 7-dihydroxychromone (4) and homeriodictyol (5) by spectral evidences, in which homeriodictyol (5) had acceleration differentiation to PC12 cell.

结果：获得了5个主要化学成分，即北美圣草素(1)， 5，7-二羟基-3′，4′-二甲氧基-二氢黄酮(2)，齐墩果酸(3)， 5，7-二羟基色原酮(4)，高北美圣草素(5)。经活性筛选试验发现，化合物高北美圣草素(5)具有促PC12细胞分化作用。

In the presence of alkalinity and tetraethyl ammonium bromide, 2,4-dihydroxy benzophenone reacts with allyl glycidyl ether to form an ethylenic derivative of benzophenone, 2-hydroxy-4-(β-hydroxy-γ-allyloxy) propyloxy benzophenone, which can further undergo hydrosilylation with polyhydromethylsiloxane.

在相转移催化剂四乙基溴化按作用下，利用2，4-二羟基二苯甲酮与烯丙基缩水甘油醚在碱性水溶液中的开环加成反应，合成了中间体4-丙氧基－2-羟基二苯甲酮，将其进一步与聚甲基氢硅氧烷进行硅氢化加成反应。

Two needle-shaped crystal chemicals were identificated from a plateau plant Halenia elliptica D. Don. Some analysis methods, such as EA, MS, NMR, FTIR and UV spectrometly, as well as melting point analysis, were used for the characterization of them, results showed that they were 1,3-dihydroxy-4,5,8-trimethoxyxanthone and 1-hydroxy-2,3,4,8-tetramethoxyxanthone.

提取并鉴定高原植物椭圆叶花锚的全草中2种针状结晶化合物；采用元素分析、核磁共振波谱、质谱、红外光谱、紫外光谱、熔点测定等分析方法，对其化学结构进行表征；产物分别为1，3-二羟基－4，5，8-三甲氧基酮和1-羟基－2，3，4，8-四甲氧基酮。

Results:From the extraction of 95% in the green peel of Juglans Mandshurica,we got five compounds,which were respectively:β-sitosterol;juglone;3,5-dimethoxy-4-hydroxybenzoic acid;regiolon;succinic acid 4-oxyethyl-5-hydroxide-β-tetralone;...

结果：从核桃楸的乙醇提取物中分离鉴定了5个化合物，分别是：β-谷甾醇；胡桃醌；3， 5-二甲氧基-4-羟基苯甲酸；regiolon；琥珀酸；4-乙氧基-5-羟基-β-四氢萘酮；胡桃酮。结论：化合物Ⅲ、Ⅶ、Ⅵ为首次从核桃楸青皮中分离得到，Ⅶ、Ⅵ为新的天然化合物。

Firstly, 2-Hydroxy-4-octyloxybenzophenone was synthesized from 2,4-dihydroxybenzophenone and octyl chloride in the presence of N-octyl-diethanolamine borate as ion liquid, and 2-Hydroxy-4-methyloxybenzo phenone was synthesized from 2,4-dihydroxybenzophenone and dimehylsulfate in the presence of N-octyl-diethanolamine borate as catalysis.

首先作为离子液体催化合成了2-羟基-4正辛氧基二苯甲酮和作为相转移催化剂合成了2-羟基-4甲氧基二苯甲酮。

The total synthese three natural compounds to explore enantioselective synthesis of flavanol: We use phloroglucin and 2, 4, 6-trihydroxyacetophone as starting materials to synthesis distenin in two ways; Resorcin was used to synthsis 2, 5-dimethoxymethoxyacetophone though 3 steps.

对黄烷醇化合物的立体选择性全合成进行了探索：以间苯三酚和2，4，6-三羟基苯乙酮为原料，尝试用两条路线对Distenin化合物进行了全合成研究；以对苯二酚为原料，经三步制得2，5-二甲氧甲氧基苯乙酮，与2，4，6-三甲氧甲氧基苯甲醛反应，经四步反应得到天然产物3，5，7，2′，5′-二五羟基黄烷关键中间体1-（2′，6′-二甲氧甲氧基苯）-3-（2&，4&，6-三甲氧甲氧基苯）丙烷-1R，2R-二醇83及其对映体84；简要介绍了EGCg类化合物的生物活性和研究概况。

Carbohydrates are usually defined as polyhydroxy aldehydes and ketones or substances that hydrolyze to yield polyhydroxy aldehydes and ketones.

碳水化合物通常的定义是多羟基的醛和酮或者水解产生多羟基的醛和酮的物质。

The structures were identified by NMR, IRand MS.Results Three compounds were identified from its 80% alcohol extract as: 5,7,3'-trihydroxy- 4'-methoxyflavanone, 4',5, 7- trihydroxyflavanone, stigmaasterol.

结果 从紫茉莉种子的80%乙醇提取物中分离到3 化合物，它们的结构分别被鉴定： 5，7，3'-三羟基-4'-甲氧基黄酮(1)， 4'，5， 7-三羟基黄酮(2)，豆甾醇(3)。

The structures were identified by nmr, irand ms.results three compounds were identified from its 80% alcohol extract as: 5,7,3'-trihydroxy- 4'-methoxyflavanone, 4',5, 7- trihydroxyflavanone, stigmaasterol.

结果 从紫茉莉种子的80%乙醇提取物中分离到3个化合物，它们的结构分别被鉴定为： 5，7，3'-三羟基-4'-甲氧基黄酮(1)， 4'，5， 7-三羟基黄酮(2)，豆甾醇(3)。

It is suggested that the scission is preceded by an aldol condensation, followed by a phenolic hydroxyl participation with scission of the C---C in the β-hydroxy-ketone formed.

经推论这一断键反应首先是发生羟醛缩合，继以在酚羟基参与下引发烷羰C－C键断裂的；还应指出，也是由于对位羟基的参与，这些烷基对羟苯基酮不形成它们的乙醇缩酮。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。