苯乙烯的

ResultsOnly five species of Pholidota genus were studied and 41 compounds were isolated and characterized including 9,10dihydrophenanthrenes, phenanthraquinone, bibenzyls, stilbenes, triterpenoids, phenyl propanoids, lignans, sterols and aliphatic compounds, and some plants and compounds exhibited analgesic, antioxidant, anticancer and NO production inhibitory activities.

结果目前石仙桃属植物研究所涉及的种类仅5种，从该属植物中分离出化学成分41种，包括9， 10二氢菲、菲醌、联苄、二苯乙烯、三萜、苯丙素、木脂素、甾体和脂肪族等结构类型。一些种类所含成分在镇痛、抗氧化、抗癌、抑制NO生成等方面显示了较好的活性。

Twenty-seven compounds were isolated from the methanol extract of the stems of Pinus massoniana by means of chromatographic methods, and their structures were elucidated as 8(14),15-Pimaradien-19-oic acid (1), Pimaric (2), Podocarpic acid (3), 12-Hydroxydehydroabietic acid (4), Dehydroabietic acid (5), 15-Hydroxydehydroabietic (6), 3β-Methoxyserrat-14-en-21-one (7), 3β-Hydroxy- serrat- 14-en-21-one (8), 3β-Methoxyserrat-14-en-21-one-30-al (9),(24R)-Stigmst- 4-ene-3-one (10),β-sitosterol (11),-3-Hydroxy-5-methoxy-stilbene(12), 4-Hydroxy-3- methoxycinnamaldehyde (13),-Ferulic acidtetracosyl ester (14), Alkylferulates (15), Pinocembin (16), Coniferaldehyde (17), Matairesinol (18),-Nortrachelogenin (19), Balanophonin (20), Cedrusin (21),-Pinoresinol (22), Tanegoside (23), 1,2-Bis-(4-hydroxy-3- methoxyphenyl)-propane-1,3-diol (24),(1S*, 2S*)-1-(4- Hydroxyphenyl) glyceri...

同时对马尾松枝条的甲醇提取物利用各种色谱技术进行了分离纯化，并利用现波谱技术鉴定了27个化合物的结构，分别为：8(14)，15-Pimaradien-19-oic acid (1)、海松酸(2)、罗汉松酸(3)、12-羟基脱氢松香酸(4)、脱氢松香酸(5)、15-羟基-脱氢松香酯(6)、3β-甲氧基-锯齿石松-14-烯-21-酮(7)、3β-Hydroxyserrat-14-en-21-one (8)、3β-Methoxyserrat-14-en-21– one-30-al (9)、(24R)-豆甾-4-烯-3-酮(10)、-3-羟基-5-甲氧基-二苯乙烯(12)、4-Hydroxy-3-methoxycinnamaldehyde (13)、-Ferulic acidtetracosyl ester (14)、Alkylferulates (15)、Pinocembin (16)、Coniferaldehyde (17)、罗汉松树脂酚(18)、 Balanophonin (20)、tanegoside (23)、1，2-Bis-(4-hydroxy- 3-methoxyphenyl)-propane- 1，3-diol (24)、(1S*，2S*)- 1-(4-hydroxyphenyl)glycerins (25)、(1R*，2R*)-1-(4-hydroxy- phenyl)gly-cerins (26)和赤松素(27)。

Diethanol amine and 2,2-bis(methylene-2-bromoisobutyrate) propionyl chloride were used as divergent reagents respectively before preparations of the second and the third generations. The resultant polymers were characterized by GPC and ~1H NMR.

为了利用含有可降解链段的树枝状聚合物(dendrimer-like polymer)制备纳米空心球，我们结合ATRP和开环反应合成了两种苯乙烯和L-丙交酯的三代树枝状共聚物CPSt(PLLA_2_2_3和CPSt(PLLA_2_2_4。

The pyranyl functional group has compatibility similar to flavonoid natural pigment, and especially facilitates the extraction of natural pigment.

它同时具备亲水性、碱性吡喃功能基团和疏水性苯乙烯骨架，对蛋白等两性生物试剂具有良好的亲合性；吡喃功能基团与黄酮类天然色素具有相似相容性，特别有利于天然色素的提取。

Through the analysis of the melt-grafting production which is obtained in different time, we can conclude the mechanism is: the St graft onto APP first, and form the stable styryl macroradicals, then MMA block onto the styryl macroradicals.

通过对不同时段的熔融接枝APP产物进行分析，推断其反应机理为：St首先接枝到APP上，形成稳定的苯乙烯大分子自由基，然后再与MMA发生嵌段反应。

Novel styryl derivatives with triphenylamine as donor and triazine as acceptor were synthesized. The two-photon absorption cross section for Ⅴ-1,Ⅴ-2 and Ⅴ-3 were determined to be 0.31×10〓cm〓/Gw, 0.365×10〓cm〓/Gw and 1. 64×10〓cm〓/Gw by femtosecond Z-san technology, respectively.

合成了以三苯胺为电子给体、三嗪为电子受体的新型二苯乙烯类化合物，用飞秒开口z-扫描测量化合物Ⅴ-1、Ⅴ-2和Ⅴ-3的双光子吸收截面分别为0.31×10〓cm〓/Gw、0.365×10〓cm〓/Gw和1.64×10〓cm〓/Gw。

Chapter 1. The modification and Structure-Activitity Relationship of Cheliensisin A Cheliensisin A (GC-51), a styryl lactone isolated from Goniothalamus cheliensis, is a potent antitumor compound.

第一章 景洪哥纳香甲素的结构修饰和构效关系研究景洪哥纳香甲素(GC-51)是从景洪哥纳香中分离得到的苯乙烯-内酯类化合物。

First, 4-(2, 3-epoxypropoxyl) benzaldehyde was obtained by reaction of 4-hydroxy benzaldehyde and epichlorohydrin. Then, the Wittig reaction was carried out to convert EBD to styryl glycidyl ether.

首先用对羟基苯甲醛和环氧氯丙烷反应制备4-(2， 3-环氧丙氧基)苯甲醛，然后通过Wittig反应将醛基转化为乙烯基得到含环氧基团的功能性单体苯乙烯基环氧丙基醚，最后用ATRP方法聚合单体SGE得到含环氧侧基的聚苯乙烯。

Preliminary experiments show that the rate of condensation of sulfanilic acid with 4-[4-(4-Ni-tro-2-sulfostyryl)-3-sulfophenyl-azo]-3-methyl-1-phenyl-5-pyrazolol is slower than those of p-phenylene diamine a...

对氨基苯磺酸和4-[4-(4-硝基-2磺基苯乙烯)-3-磺基苯偶氮]-1-苯-3-甲-5-羟吡唑在稀的氢氧化钠溶液中缩合的速度，较对苯二胺及对氨基苯甲酸为慢。

Objective: To study lipid-regulating action of 2, 3, 5, 4′-tetrahydroxy stilbene-2- O-β-D -glucopyranoside from Polygonum multiflorum on experimental model hyperlipidemic rats.

中文摘要：目的：研究何首乌的2，3，5，4′-四羟基二苯乙烯-2- O-β-D -葡萄糖苷对实验性高脂血症大鼠的调脂作用。

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。