二苯乙烯

UV and HPLC were used for the first time to study the photo-cis-trans isomerism in dilute DNS solution.

首次采用紫外光谱和高压液相色谱初步研究了4，4'-二硝基二苯乙烯-2，2'-二磺酸稀溶液中的光致顺反异构现象。

Oligostilbenes are a type of compounds with complex structures and multi-faced bioactivities, polymerized from stilbene monomers.

二苯乙烯类低聚体是由二苯乙烯单体以不同方式聚合而成的一类结构复杂，具有多种生物活性的化合物。

Methoxystilbene and 2-methoxy-4'-nitrostilbene were synthesized from benzyl chloride and nitrobenzyl chloride by the Wittig reaction, and used as intermediates for the synthesis of the final product fluorescent whitener FP4,4'-bis(2-methoxystyrylbiphenyl via reduction and diazotisation of the latter followed by reaction with the former in the presence of NaOH.

以氯化苄和对硝基氯苄为原料，经Wittig反应合成中间体：2-甲氧基-二苯乙烯和2-甲氧基-4'-硝基-二苯乙烯。后者经还原反应、重氮化反应后，在氢氧化钠存在下与前者反应生成最终产品荧光增白剂FP4，4'-双-2-(甲氧基苯乙烯基联苯。为该类荧光增白剂的合成开辟了一条新路线

Results Compound albicanyl caffeate displayed strong antifungal property with MIC 4 μg/ml, while moderate antifungal effects (MIC16 μg/ml)were observed with compounds emodin, resveratrol, 3,4'-difluorostilbene, 2,2'-difluorostilbene and 2,3',5'-trifluorostilbene. Pakyonol, catechin, ampelopsin A, 3,4,4'-trihydroxyl- bibenzyl, 2,4'-difluorostilbene, 4-fluorostilbene,2-methyloxy-4'-fluorostilbene showed lower activity with MIC 32 μ g/ml.

结果化合物albicanyl caffeate对白色念珠菌表现出强的抗真菌活性，MIC为4μg/ml；而化合物大黄素、白藜芦醇、3，4'-二氟二苯乙烯、2，2'-二氟二苯乙烯及2，3'，5'-三氟二苯乙烯显示出中等程度的抗真菌活性，MIC为16μg/ml；双联苄pakyonol、多酚类儿茶素、白藜芦醇二聚体野葡萄素A、3，4，4'-三羟基联苄、2，4'-二氟二苯乙烯、4-氟二苯乙烯及2-甲氧基-4'-氟二苯乙烯显示出较弱的抗真菌活性，MIC为32 μg/ml。

In the prepared process, 1,8- dihydric anthraquinone and 2,3,5,4-tetrahydroxystilbene-2- O-3 -D-glucoside were chosen as detected targets, the quality of 4 prepared method, high pressure steamed method, prepared method with beans, prepared method with ginger, prepared method with yellow wine, was compared.

以1，8-二羟基蒽醌和二苯乙烯甙作为检测指标，对黑豆炮制法、姜制法、酒制法和高压清蒸法四种方法进行比较，发现高压清蒸法得到的产品中游离态蒽醌和二苯乙烯甙含量最高，分别是其它三种炮制品的1.78～1.84倍和1.06～1.61倍。

Based on reviewing of functionalization of saturated carbon by catalytic oxidation with metalloporphyrins and metal phthalocyanines as a mimic of the enzyme cytochrome P-450, two reaction systems of which one was the preparation of 4, 4'-dinitrostilbene-2, 2'-disulfonic acid from 4-nitrotoluene2-sulfonic acid and the other was the preparation of 4, 4'-bis (dimethylamino -diphenyl) phenylmethanol from 4, 4'-bis (dimethylamino-diphenyl) phenyl methane , were specifically studied as carfunctionalization and oxyfunctionalization of saturated carbon.

本文在全面综述金属卟啉和金属酞菁类模拟细胞色素P-450酶催化剂催化氧化饱和碳原子功能化的基础上，选择由4-硝基甲苯-2-磺酸制取4，4'-二硝基二苯乙烯-2，2'-二磺酸和由4，4'-二苯基甲烷制取4，4'-二苯基甲醇两个反应体系进行饱和碳原子碳功能化和氧功能化的具体研究。

When pumped with 800 nm laser irradiation, 2 {4 [2 (4 dimethylamino phenyl vinyl] phenyl} ethylamino ethanol and 2 {4 [2 (4 diethylamino phenyl vinyl] phenyl} ethylamino ethanol show strong two photon induced blue fluorescence at 436 and 440 nm respectively, while DMANHAS and 4 nitro benzoic acid 2 {4 [2 (4 diethylamino phenyl vinyl] phenyl} ethylamino ethyl ester exhibit no fluorescence.

在800 nm的飞秒脉冲激光激发下，反式-4-(N-羟乙基-N'-乙基氨基)-4'-二苯乙烯和反式-4-(N-羟乙基-N'-乙基氨基)-4'-二苯乙烯均发出较强的蓝紫色上转换荧光，荧光峰分别位于436和440 nm，而DMANHAS和反式-4-[N-(乙氧基羰基-4-硝基苯基)-N'-乙基氨基]-4'-二苯乙烯没有荧光。

Finally, 4, 4'-diaminostilbene-2, 2'-disulfonic acid with high quality was synthesized from DNS after purification.

研究结果表明，适宜的重结晶温度约为85℃，优化pH值为9~10，以重结晶后所得精制DNS为原料可制备高品质4，4'-二氨基二苯乙烯－2，2'-二磺酸。

Totally 50 male Kunming mice were recruited and randomized into 5 groups: normal control group, model group,positive control group, 2,3,5,4'-tetrahydroxystilbene-2-O-β-D-glucoside 0.03 g/kg group (low-dose group), and 2,3,5,4 '-tetrahydroxystilbene-2-O-β- D-glucoside 0.1 g/kg group(high-dose group).2,3,5,4'-tetrahydroxystil bene-2-O-β-D-glucoside was an effective component extracted from Chinese herb tuber fleeceflower root in the Department of Pharmacology, Xuanwu Hospital of Capital University of Medical Sciences.

选取雄性昆明小鼠50只，随机分为5组：即正常组、模型组、阳性对照组、二苯乙烯苷0.03g/kg组、二苯乙烯苷0.1g/kg组。

Chiral ligands mentioned above and their complexes with acetate copper were used as enantio-selective catalysts in asymmetric cyclopropanation reactions of diazoacetate and 1,1-diphenyl ethylene. Investigations indicate that all of them reveal certain optical-selective capability, but chiral C2-symmetric 2,6-bispyridine ligands show better catalytic capability than chiral asymmetric schifF-base ligands.

选择了2个手性2，6-吡啶双噁唑啉配体和6个手性不对称席夫碱配体与醋酸铜形成的配合物作为催化剂，对重氮乙酸乙酯与1，1-二苯乙烯不对称环加成进行催化反应，发现这8个催化剂对1，1-二苯乙烯的不对称环丙烷化反应都表现出了一定的光学活性诱导能力，手性2，6-吡啶双噁唑啉-铜类具有比手性Schiff碱-铜类更好的催化性能。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。